Malicious PDF — malware analysis report

Static analysis result for SHA-256 952e0ec9d21502f6…

MALICIOUS

PDF

86.6 KB Created: 2021-03-09 23:32:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b101b5dda088ff8d2ddaa32a027330ce SHA-1: 968272e3259035bbe3c17f0a8374b33073db0e76 SHA-256: 952e0ec9d21502f62162a4452f1d8b7a89f5dcc30a1136ca9579d827f56ad08a
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 point to other PDFs, suggesting a link farm or SEO poisoning tactic. ClamAV and ML classifiers identified this file as malicious, specifically as a phishing or trojan variant. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' indicate an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://bologen.ru/award?keyword=trifilar+suspension+experiment+pdf
    • https://static.s123-cdn-static.com/uploads/4427287/normal_5ffcad1b5a9cc.pdf
    • https://static.s123-cdn-static.com/uploads/4471109/normal_6003aa3ab8fea.pdf
    • https://cdn-cms.f-static.net/uploads/4375209/normal_601bfd2777900.pdf
    • https://static.s123-cdn-static.com/uploads/4422373/normal_5fc9f3c4772c8.pdf
    • https://static.s123-cdn-static.com/uploads/4409627/normal_5fe29ae8e6bdd.pdf
    • https://cdn-cms.f-static.net/uploads/4460982/normal_60399bc48dddb.pdf
    • https://static.s123-cdn-static.com/uploads/4383802/normal_5ffd58506bfd6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://e4fb9bf1-a3d6-4767-9bf2-2a1021e5dc09.filesusr.com/ugd/53cfc7_c3b169526ae54e6c9cab283cd29abbd5.pdf?index=true
    • https://a4edf7fa-b057-49b5-8014-e5fd436fbef3.filesusr.com/ugd/c8b2c5_94259bf9572f40a19a4cefd7021ce124.pdf?index=true
    • https://2e03c77f-99cc-4591-9807-54d8d49c9ce6.filesusr.com/ugd/759733_2b4e112b44ab4379a5fdd08bb150da45.pdf?index=true
    • https://dda5c79a-a75d-44d9-a006-48dec3bfe172.filesusr.com/ugd/115d6e_fbbf079a52404025bfdeda38b82270c7.pdf?index=true
    • https://s3.amazonaws.com/xukanomarexumu/diabetes_guidelines_2018_summary.pdf
    • https://64b67c6e-fbbd-4787-add8-9ed3e274c95c.filesusr.com/ugd/eb6612_ec7d557c25d54e74864fe24d79ec3e0e.pdf?index=true
    • https://s3.amazonaws.com/vovabagubajegeb/articles_test.pdf
    • https://d5fb4b5d-766d-4e54-ab1c-ecc61d2b7d82.filesusr.com/ugd/b0c8dc_ad93d37638d74a67a6d4698519841e1a.pdf?index=true
    • https://7ffe38df-ef78-47a1-8632-a9c579db478a.filesusr.com/ugd/8ff694_9f8a3776b51e48f4b837d6b75bfc0bc7.pdf?index=true
    • https://s3.amazonaws.com/waxegatulo/zewogaxipawufilibameta.pdf
    • https://f733e552-90a1-4d1f-83ca-a6b36afcf31c.filesusr.com/ugd/38bf1f_da39c6670af842428962fcd4d086d7d8.pdf?index=true
    • https://e1cd7dcf-8988-4be8-9b1a-722367337987.filesusr.com/ugd/6203b9_84f83b6322934a3f922315095d7ae224.pdf?index=true
    • https://4b67404f-136a-46a0-9cf3-151f2d38faab.filesusr.com/ugd/241fd5_4e3cbe68cd89413ba12caf8ea60c62ca.pdf?index=true
    • https://s3.amazonaws.com/jojitagifuva/65185055456.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbf3.bin
16eeead1ca337964e80825dfb8a5da01e6f5be75c79bd5c29f690a724fb2c392		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF3 5204 bytes
font_01_sfnt_off00010d91.bin
fdd605cf2b935458c5f5d5627e56e9a57df28a590f853cf2d8f8dcb726b5c4e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D91 10888 bytes
font_02_sfnt_off000132bc.bin
d25c4a1012e7e273cd696c361e8dd8fca8569f2a08114edc926436d788bb3c52		 pdf-font-stream PDF embedded font (sfnt) at offset 0x132BC 17428 bytes

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