Malicious PDF — malware analysis report

Static analysis result for SHA-256 44d035e4da3cc4f6…

MALICIOUS

PDF

93.6 KB Created: 2021-03-17 20:59:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 6e0e4a7cec9ac7d7ae376c8349263e2b SHA-1: b896131befcde2cea167b919fb6f82e00795bc57 SHA-256: 44d035e4da3cc4f64c97f7c78f2c2142a07b8a0077361fcd2e2eefe8c6220766
186 Risk Score

Malware Insights

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

This PDF document was identified as malicious by multiple heuristics and an ML classifier, indicating a phishing or malware distribution attempt. It contains a link farm with numerous external URLs, suggesting an effort to redirect users to potentially harmful sites. The document body, though heavily obfuscated, appears to be a lure related to 'business english vocabulary'. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://resalured.ru/award?keyword=business+english+vocabulary+for+beginners+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368979/normal_602ae23faac14.pdfIn PDF document text
    • http://gojovujewinunuj.mygamesonline.org/jafifetu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448345/normal_5fe5b14250ecc.pdfIn PDF document text
    • http://lopitimew.mygamesonline.org/optical_fiber_communication_govind_p_agrawal_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425009/normal_604386538e375.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386822/normal_60378258f2a88.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a0f88182-e1f9-4a9c-ba22-d5ce004c6985.filesusr.com/ugd/2f3216_2fad3df1fa69417ca73d545c46fb8d9e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9a824e5-92eb-4d9e-9337-ec12bde53fda/glacier_bay_dual_flush_toilet_weak_flush.pdfIn PDF document text
    • http://welegovejebiwun.epizy.com/critical_theory_very_short_introduction.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68eb903c-fa31-467a-9c50-85b4de80d05d/how_to_reset_tp-link_tl-wa855re.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23ce80bf-fa95-4b1e-bde1-0da55571b055/jawbone_jambox_charging_port_replacement.pdfIn PDF document text
    • http://fipepazis.epizy.com/70849164120.pdfIn PDF document text
    • http://dimizisunope.epizy.com/what_is_the_meaning_of_visual_aid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d033e4b9-18ad-44bc-9f76-7eab6c8ff45b/83961659190.pdfIn PDF document text
    • http://tagaboja.epizy.com/21072506630.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ec3303f-70a5-4c40-ae74-55b34eddba11/86658160668.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1aec40e2-c09a-4b82-b676-312f322fd76c/what_are_examples_of_themes_in_literature.pdfIn PDF document text
    • https://ab2ac9d4-4772-4872-829d-c19fde0a4f90.filesusr.com/ugd/b919b3_91acda2d31174810b8efdfa4d4b7b9e5.pdf?index=trueIn PDF document text
    • https://7f3356c1-ec1f-498a-9d41-5b36c14d87b7.filesusr.com/ugd/98d33d_8a4e3014ed7e418aab4179cc21dba52e.pdf?index=trueIn PDF document text
    • http://siwojanapav.epizy.com/citadel_forged_with_fire_guide_for.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/787b8a1e-b12d-4f16-9bfd-822a5413cc63/kexusadumosaninezakevamu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13e66e8c-0501-4856-9f70-0fcc5813cfec/what_is_model_3_track_mode.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1620686-1e94-444c-8eea-70de95a4c3ce/purura.pdfIn 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_off000131bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131BB 5768 bytes
SHA-256: 6297364f0d4537375445638fcc23894ba4e18929d91a0012c90be587222f537b
font_01_sfnt_off0001456a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1456A 10404 bytes
SHA-256: f749ad6a1978dac7c2be715445dd1ec847d3379b3cad648d572a22a6effa3a23

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