Malicious PDF — malware analysis report

Static analysis result for SHA-256 522bc278d4c5b203…

MALICIOUS

PDF

77.8 KB Created: 2021-03-15 21:19:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10a4a4d64340617bcdd36042091561d2 SHA-1: 414b50a7e7fb46f362e71bbc094e7b6cd433ef02 SHA-256: 522bc278d4c5b20380748d0d7feaba042f1678501011b312f574d1f2bb5318c1
156 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, indicating a link farm or redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://dafemum.ru/aws?utm_term=los+fundamentos+basicos+del+voleibol
    • https://cdn.sqhk.co/wesebewoweva/id2bigL/52991578179.pdf
    • https://dasufurejer.weebly.com/uploads/1/3/0/9/130969026/xomit.pdf
    • http://sajogol.iblogger.org/how_important_is_social_media_marketing_for_small_businesses_research.pdf
    • https://zuwogirunuwexi.weebly.com/uploads/1/3/5/3/135331524/9244854.pdf
    • http://idealicait.site/bacteriophage_life_cyclek4fqa.pdf
    • https://siwevobone.weebly.com/uploads/1/3/5/3/135317475/657619.pdf
    • https://lamosovi.weebly.com/uploads/1/3/4/6/134600354/begonov.pdf
    • https://xelopapet.weebly.com/uploads/1/3/0/7/130775154/658507.pdf
    • https://mifimixaxenerut.weebly.com/uploads/1/3/3/9/133999571/funep-weduzebenuga.pdf
    • https://wurixexaf.weebly.com/uploads/1/3/4/8/134865586/4480157.pdf
    • https://koxiguxizabi.weebly.com/uploads/1/3/1/1/131163763/banufude.pdf
    • http://gufutaca3.xyz/sawaginonkvma1.pdf
    • https://lenagabonozizaj.weebly.com/uploads/1/3/4/3/134314127/fasizij.pdf
    • http://fixebojamofi.iblogger.org/bootcamp_windows_7_macbook_pro.pdf
    • https://letonezesuju.weebly.com/uploads/1/3/1/3/131383444/39ee397.pdf
    • https://cdn.sqhk.co/misusulebix/CQhHgeP/50992746704.pdf
    • https://cdn.sqhk.co/xubipoxeguza/QWhigfO/bifuzagun.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nexisaxilesa.rf.gd/70367101224.pdf
    • http://zojasofox.epizy.com/37108501909.pdf
    • https://9049409e-dcbb-43fe-b7cb-0f7a5d042cf1.filesusr.com/ugd/e59eee_1e57ae6b9ce64281bf227ccd96b0ab5b.pdf?index=true
    • https://3c3b6f52-20a2-448a-be11-eec5930c502f.filesusr.com/ugd/0ca786_67d7ed4497fd4c56bf471a16514d157f.pdf?index=true
    • https://48e5b1ff-25fb-49a4-826b-3ad3f3a15688.filesusr.com/ugd/0d632a_26419ac34119423083f8b6f3ac627e7a.pdf?index=true
    • http://simolerifape.epizy.com/airtel_monthly_data_plan_for_android.pdf
    • https://e1eccfe9-8888-4f52-a155-e9c8e84e0752.filesusr.com/ugd/4fb05f_bdb0c7d615e7491c924878c2cb313274.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2d4.bin
e36f39255bb7acac2cdd15b7c33594e570a5590c706f3ce48994812acd193bfc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D4 5212 bytes
font_01_sfnt_off0001048b.bin
82fda1df497d6962fcf3bfc2d2f5284d6a64498dda81474c841b49772744764d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1048B 11012 bytes

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