Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f9041ad5a97ec6b…

MALICIOUS

PDF

75.8 KB Created: 2021-03-05 15:39:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 041270ce2c7f1f821f1a9c39670516db SHA-1: 488f61e93d481f067619543143cb843fe5f019fe SHA-256: 6f9041ad5a97ec6b368b4f053be6bbfa0e8ec5408d6761b173f5d838fcf24d27
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 pointing to PDF files, suggesting a link-farming or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://golowaki.ru/aws?utm_term=interior+design+ideas+living+room+2020
    • https://cdn.sqhk.co/mibajufaneja/jnmyhgD/54006725911.pdf
    • https://jaweditulopo.weebly.com/uploads/1/3/4/3/134313576/sezozi.pdf
    • http://buybritishcat.com/reportajes_radiales_ejemplosl5fvq.pdf
    • https://cdn.sqhk.co/sunaxidida/ijahgjg/weparilaran.pdf
    • https://cdn.sqhk.co/depadukat/jxDihmS/monster_roblox_royale_high_codes.pdf
    • https://cdn.sqhk.co/wuxaguzifep/eCcgjSZ/healthy_vegan_gluten_free_pancake_recipe.pdf
    • http://mon-cmbretagne.com/43151919334826e3.pdf
    • https://sufudavinor.weebly.com/uploads/1/3/1/3/131381021/731593.pdf
    • http://bedating.online/xafezibuh534u.pdf
    • https://cdn.sqhk.co/gatuwaven/hhidjep/rusofiwu.pdf
    • https://worijuxadije.weebly.com/uploads/1/3/4/8/134863955/8577063.pdf
    • https://feveronibamuja.weebly.com/uploads/1/3/5/3/135300243/nukuribafaximu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/mulerux/datezopipeli.pdf
    • https://91313464-3f42-441e-b0e8-b27065d471ad.filesusr.com/ugd/ee9d3f_c8af0dd3828f4db6965fd09160094b03.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d038d35a-5c36-4680-90bc-81f9e4d088a0/at_lp60x_manual.pdf
    • https://3568c1c9-c281-4b9a-9ea9-d5d291e0176b.filesusr.com/ugd/e5d8db_0affdc42b4184ed38d91d67635c6cd15.pdf?index=true
    • https://d670dda7-df53-4ef1-8eda-d3256df28744.filesusr.com/ugd/dbbbec_6c4a0380e1214b58b852a3d27d5d9c58.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e00bf9b0-f89d-412c-a4dd-5adc7c552627/2006_chevy_malibu_repair_manual_download.pdf
    • https://s3.amazonaws.com/bipovoromoj/alternate_angles_worksheet_ks3.pdf
    • https://uploads.strikinglycdn.com/files/9d508182-3907-422c-8f17-44e4b75d962b/3804608451.pdf
    • https://s3.amazonaws.com/kulinisokakewi/html_form_action_javascript.pdf
    • https://s3.amazonaws.com/pazerogasarinu/how_much_do_millionaires_make.pdf
    • https://a21f0d7d-5fe0-4a99-a381-3b18266e0880.filesusr.com/ugd/6c313a_48ec17964aa44f828cc1ae23f6352ead.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_off0000eb6e.bin
ad8be37cca7857e25f530f1a1a614548ca85186552f3b762df5eb3ba31557ce7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6E 5416 bytes
font_01_sfnt_off0000fdc5.bin
a303f18937f3733eb57d34d3193d4563bfe3fe7ac1508c95fe57fe802299452c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC5 10924 bytes

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