Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b486d34806d1aa5…

MALICIOUS

PDF

102.9 KB Created: 2021-04-07 10:23:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 44c9718bfa5e74f7b51ed1d68d749b03 SHA-1: 724c9abb2a24fd1794793a38bea68e5ce3988efb SHA-256: 2b486d34806d1aa56d114ad167bc726d647671a26df8d44a59bf2f934990512c
176 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of a large number of external links, many pointing to PDF files, suggests a link farm or SEO poisoning attempt. The 'SE_CALLBACK_LURE' heuristic specifically identifies the document's attempt to trick users into calling a phone number under the guise of a billing or security issue. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of phishing or scamming activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://ponafet.ru/123?utm_term=training+report+on+building+construction+pdf+file
    • https://static.s123-cdn-static.com/uploads/4485442/normal_5fff36d22d5d3.pdf
    • http://pifowovumuwe.medianewsonline.com/ashrae_62._2_2020.pdf
    • https://zofoneparadi.weebly.com/uploads/1/3/5/3/135341866/binilenedujokaf_novaruduwi_mibaxige.pdf
    • https://zefotuji.weebly.com/uploads/1/3/0/7/130738972/nuzosu_zuxudo.pdf
    • https://cdn-cms.f-static.net/uploads/4494883/normal_600d62744d14d.pdf
    • https://static.s123-cdn-static.com/uploads/4489725/normal_5fe1ccfb20ef7.pdf
    • https://static.s123-cdn-static.com/uploads/4388037/normal_5fc738c5adce3.pdf
    • http://nigavereke.mygamesonline.org/dafarugozige.pdf
    • http://xizugef.medianewsonline.com/analytic_philosophy_bertrand_russell.pdf
    • https://vetedikagumon.weebly.com/uploads/1/3/1/4/131453784/d8e294cf.pdf
    • http://vipimuxatomefi.medianewsonline.com/jenokiwugu.pdf
    • https://cdn-cms.f-static.net/uploads/4448540/normal_6053bef7d061b.pdf
    • https://toxuxejegeze.weebly.com/uploads/1/3/5/3/135317786/7d065155420.pdf
    • http://vatetuda.scienceontheweb.net/xovipagirubofigopu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/xuxifuzituwu/a_good_wife_game.pdf
    • https://s3.amazonaws.com/resabomibogodaw/2942355190.pdf
    • https://s3.amazonaws.com/gozifep/gavijakuve.pdf
    • https://s3.amazonaws.com/jusagi/rwby_silver_eyes_song.pdf
    • https://s3.amazonaws.com/jawusawar/is_the_new_top_boy_on_netflix.pdf
    • https://s3.amazonaws.com/xotomisen/30122760595.pdf
    • https://s3.amazonaws.com/mexijegedakol/fc_basel_spielplan.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000130b6.bin
71a1ced0c9ec8b7e5c8b544cd796b8b02870501a4cfe11c6a091bc7ea7cf40ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x130B6 5292 bytes
font_01_sfnt_off000142ae.bin
8c8b3a4ffcb9ee2604bdf9d3cf2ddc1d16b2a88d8edb27f4eb99d5d78040a22f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x142AE 11724 bytes
font_02_sfnt_off00016af1.bin
2173a1880e9f774f759393e7d0d28dda91d04d8a3eae6bea41b822770b343b90		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16AF1 16060 bytes
font_03_sfnt_off00017f88.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17F88 4324 bytes

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