Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7b60d5b539ceedc…

MALICIOUS

PDF

69.8 KB Created: 2021-04-04 08:47:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 650ed1eb1262388a373cedc70c0a8235 SHA-1: db564ffa8ebb854b67b900ed550fd36a8fbbd28a SHA-256: e7b60d5b539ceedc42c4f55e66de667bd943aa576b25fe182bdca1a3b3ad9c1c
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO poisoning tactic. The primary malicious URL identified is pelibifir.ru, which is likely used to host phishing content or further malware. No scripts were extracted, but the presence of numerous external links and the overall structure strongly suggest a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/123?utm_term=countif+colored+cell+google+sheets
    • https://static.s123-cdn-static.com/uploads/4376875/normal_5fed214cf371f.pdf
    • https://cdn.sqhk.co/nisifowisom/jjnijWo/34484065994.pdf
    • https://zunejekuriraruk.weebly.com/uploads/1/3/2/7/132712234/ab2e05b48.pdf
    • https://vutajavegev.weebly.com/uploads/1/3/4/0/134040502/7d02d99c5002fa.pdf
    • https://cdn.sqhk.co/volumusigu/jjhbbHh/6288007779.pdf
    • https://cdn.sqhk.co/zogowefu/gjegfX7/garfield_rush_game_online.pdf
    • https://cdn-cms.f-static.net/uploads/4450896/normal_602188e82e0a2.pdf
    • https://cdn-cms.f-static.net/uploads/4391621/normal_5fd667c74b8df.pdf
    • https://cdn-cms.f-static.net/uploads/4373985/normal_6038de7870452.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/zoxewudunigus/surgery_prophylaxis_antibiotic_guidelines.pdf
    • https://s3.amazonaws.com/womirofop/tetemefumogulawirut.pdf
    • https://aca56392-15ae-48e8-982c-fdf6c4ac0dc3.filesusr.com/ugd/00c070_f3a864cb8e114df9b62e2fcaf07d9fd1.pdf?index=true
    • https://s3.amazonaws.com/rurovikejigibu/61125921823.pdf
    • https://s3.amazonaws.com/xeponodij/bootstrap_templates_with_code.pdf
    • https://s3.amazonaws.com/wajibile/9_app_free.pdf
    • https://s3.amazonaws.com/bufexa/kuvezewopiporediwenufibi.pdf
    • https://8ed7b8cb-9bae-4def-ad9b-66b28cd11f91.filesusr.com/ugd/740d8c_16a0ea84788a42fda3067eb9098fffdd.pdf?index=true
    • https://s3.amazonaws.com/dipafuxe/68404435513.pdf
    • https://s3.amazonaws.com/lulelepese/knockout_js_spa_template.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c69b.bin
76f1e055c448c6ae3034c18430d96afdc638de4a089167311caa46b7084e920b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC69B 4976 bytes
font_01_sfnt_off0000d782.bin
c8cc527bff3108ae5e59e6140f20d65405adf56fdd12b0e16fc363165996310d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD782 10428 bytes
font_02_sfnt_off0000fb39.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB39 4324 bytes

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