Malicious PDF — malware analysis report

Static analysis result for SHA-256 d767d57cf3102c66…

MALICIOUS

PDF

80.7 KB Created: 2021-03-12 21:45:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: c04ef663c201942f9416e5d48b65ad75 SHA-1: f283984fce07a93bdd2e440c8fde69953eb463cf SHA-256: d767d57cf3102c661aa9e5767dda2834894c73c8b2ca514357acf4fe4ad3fd8c
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. The embedded URLs point to potentially malicious domains, and the document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://druttle.ru/wix?keyword=a+la+claire+fontaine+meaning PDF link annotation
    • http://creditscoretracking.info/851004533447qamj.pdfIn PDF document text
    • https://jozurukezareta.weebly.com/uploads/1/3/4/7/134741488/fomexitem-rewalodaviw-xijegomedo-wometuvebak.pdfIn PDF document text
    • http://masalev.ru/dozaju2govz.pdfIn PDF document text
    • https://roguxewotare.weebly.com/uploads/1/3/4/3/134319265/kukovuxemagumijuxi.pdfIn PDF document text
    • https://buxexemap.weebly.com/uploads/1/3/4/8/134890763/ribubod.pdfIn PDF document text
    • http://titoto.xyz/zoom_g11_pedal_priceggrek.pdfIn PDF document text
    • https://pevolevu.weebly.com/uploads/1/3/1/6/131606362/kakuxerafuwofovekewi.pdfIn PDF document text
    • http://immortal-sho.club/40178427715d74er.pdfIn PDF document text
    • http://ens-pictures.ru/yellow_belly_slider_care_sheet7g4qb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6afed14e-2b01-442b-8c2e-11a8a6f39965.filesusr.com/ugd/46a5ae_15c1103666f3426c9e1a06cac6ba9ff3.pdf?index=trueIn PDF document text
    • https://9de673a2-3b8e-40eb-bbf5-c0ad8e71a3da.filesusr.com/ugd/bd5c68_6747222885b8491abc3f8177f80e8f07.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sedowedi/dyson_ball_animal_2_vacuum_manual.pdfIn PDF document text
    • https://65d0a56f-4074-4e8f-9acc-29e6f8e8f663.filesusr.com/ugd/37655d_505c1061b55b47f4aa9b112d030c2832.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mijumomub/professional_cv_template_ireland.pdfIn PDF document text
    • https://bff5fdab-9fd0-4670-908b-a1308bb5a9cb.filesusr.com/ugd/227d0f_c809c784e41b4508be2da741bc8dc0ce.pdf?index=trueIn PDF document text
    • https://858e1da1-ad31-4e5b-aec0-89c59c6c71f6.filesusr.com/ugd/6240f8_c4cfa109879d4c4a97773b7d2f7f33b4.pdf?index=trueIn PDF document text
    • https://6c9aa500-f8d9-42a6-b8a4-5b3c562bbfc3.filesusr.com/ugd/543886_d4b6d9b3beac499e8b6e214a1ea074e0.pdf?index=trueIn PDF document text
    • https://6b52f5a6-db44-4d3e-8337-ab33c729cb13.filesusr.com/ugd/f4de5e_9930dfd19ab749de90a30b53dfd5db3e.pdf?index=trueIn PDF document text
    • https://5c90cfa9-af55-48e2-9430-1f3580382729.filesusr.com/ugd/e2b09b_8d75027f0d4b4299a8504816c52574cb.pdf?index=trueIn PDF document text
    • https://c4a5d104-04f9-44e6-b03f-1f5edac3680f.filesusr.com/ugd/f23921_9efd0e7f8cda4c6699f694d24bdf7e12.pdf?index=trueIn PDF document text
    • https://44407f20-7244-4107-9544-84d8151b6f9a.filesusr.com/ugd/8508de_b3ef760a0f6c4bf5be66de5f4bbd3368.pdf?index=trueIn PDF document text
    • https://ac734925-007a-49fa-9a6b-2340142042ec.filesusr.com/ugd/ea78e0_eeaf0148e5f342feb1b66465d6705d22.pdf?index=trueIn PDF document text
    • https://80b1f93a-fe74-4439-a81d-34814fa7a505.filesusr.com/ugd/e56fe2_01939e5d000b47969b0ad68a31aad407.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/piwanisaj/dvdrip_movies_bollywood_free.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubatebedoxez/23133729060.pdfIn PDF document text
    • https://203aa715-7352-46b1-b16b-5d0aeeaa27a2.filesusr.com/ugd/0582e0_283899778db44d56b8843feb75e388e2.pdf?index=trueIn PDF document text
    • https://9e9203d9-9f5b-42f2-a849-05e42d741f90.filesusr.com/ugd/3527d5_32bafcb50cf045389ef52757e9974b99.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7D 5012 bytes
SHA-256: 6349e59891c28987728597ec02ce71305574a1af2f5e1ee4556e027b62427d69
font_01_sfnt_off00011072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11072 10764 bytes
SHA-256: 5ba3e7c97e9de852c3a6e327b424a39f941487cb55187cb9e77a1fe032bc387e

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