Malicious PDF — malware analysis report

Static analysis result for SHA-256 de7f7958298671d3…

MALICIOUS

PDF

99.8 KB Created: 2021-04-28 13:20:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d1b9cecfe0d2ed5f3f218717fecf8930 SHA-1: 1214367ce13816cdc76ddc6bfd388fcd5b30e8cb SHA-256: de7f7958298671d3c4d7c1b386c5ab98f75e0fa6d707e50bed3e3d2db26ad1a2
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to other PDF files, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs point to suspicious domains, and the document body, though heavily obfuscated, contains keywords related to financial documents, which is a common lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/strik?utm_term=plan+unico+de+cuentas+bajo+niif+excel
    • https://cdn-cms.f-static.net/uploads/4416802/normal_604d63930033c.pdf
    • http://leziwazedo.mypressonline.com/south_africa_blank_map.pdf
    • https://cdn-cms.f-static.net/uploads/4491723/normal_604467c07d2ed.pdf
    • https://cdn-cms.f-static.net/uploads/4388279/normal_5fd7791d777ed.pdf
    • https://cdn-cms.f-static.net/uploads/4383795/normal_5fd5f3163dab5.pdf
    • https://cdn-cms.f-static.net/uploads/4487902/normal_6031dbd527f9f.pdf
    • https://cdn-cms.f-static.net/uploads/4505102/normal_6040e8c8b1455.pdf
    • https://static.s123-cdn-static.com/uploads/4425515/normal_5ff35388f139d.pdf
    • https://static.s123-cdn-static.com/uploads/4393364/normal_5fe228a53245c.pdf
    • http://kegojekazaso.22web.org/apple_make_appointment_in_store.pdf
    • http://bukuxojunuz.mypressonline.com/the_canterbury_tales_a_prose_version_in_modern_english.pdf
    • https://cdn-cms.f-static.net/uploads/4476782/normal_6050b0b818269.pdf
    • http://raguvigawak.mypressonline.com/givibi.pdf
    • http://remunomixet.22web.org/26279044072.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/0f15aba5-f191-41bc-ab89-5e82d894e08c/fighting_climax_pc_download.pdf
    • http://bifiwapaz.onlinewebshop.net/accessory_to_war_download.pdf
    • https://2ddc7431-ff91-46e9-9708-195efd6cc195.filesusr.com/ugd/ffe0d3_a874f14996bf4f8a9cde21b58c609d49.pdf?index=true
    • https://6f672a44-e16c-4921-a0f1-e3781c0647c5.filesusr.com/ugd/bda22a_c212e4b2181747578ccbfed4df9d74e1.pdf?index=true
    • http://jokubamobivavum.onlinewebshop.net/surumofofufufa.pdf
    • http://xofunuxemijowex.rf.gd/trig_identities_worksheet_2_answers.pdf
    • http://bodagoge.epizy.com/what_is_the_meaning_of_liminal_space.pdf
    • https://uploads.strikinglycdn.com/files/b91d6541-2fdf-4ecd-bb74-43de70a8aa2d/norojadususodejax.pdf
    • https://uploads.strikinglycdn.com/files/858607f0-7e7a-41e2-a688-678b58904493/diablo_3_official_game_guide.pdf
    • https://48cc712b-de5e-493e-a198-f8962849e22b.filesusr.com/ugd/d2751c_0324bf7d4c004be98a5fef1d37bbb41e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/39d79035-233d-41c7-a70d-2595f346144d/jitubijoxexil.pdf
    • https://b4095e1f-5e43-4c35-8b28-ff0c3185c247.filesusr.com/ugd/9cc3de_b9f4b261ffe34e8087d57cee280b9588.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001258d.bin
3b262881bf41f4db1d8131a25e65d2ef6822c8fe91f9d6cfd9222b348496fb30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1258D 5204 bytes
font_01_sfnt_off00013755.bin
6a77f955d39b9d81e75477a2b3a68a06f90d7b352a411c8fd057aba46c531b2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13755 2236 bytes
font_02_sfnt_off0001416c.bin
caff36c1487a90f993d4f82d526de05eab8d94bce3bb2dba1d412ebf4850536f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1416C 12348 bytes
font_03_sfnt_off000169dc.bin
e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15		 pdf-font-stream PDF embedded font (sfnt) at offset 0x169DC 16204 bytes

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