Malicious PDF — malware analysis report

Static analysis result for SHA-256 fad5c2c8addf399b…

MALICIOUS

PDF

89.0 KB Created: 2021-06-12 12:26:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 8dca0bc50b767758358c2c8e6d79b77e SHA-1: 55760b0f15b804e150800dfcf2ef6b4f6f7ace35 SHA-256: fad5c2c8addf399b0898f16d3c5c184804b025b6f136eecfbe78ac6795ab8b48
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains a large number of external links, many pointing to disposable hosting services, indicative of a link farm. The primary URL, 'https://laborke.ru/pbw?utm_term=bts+love+yourself+answer+mp3+download', suggests a lure related to popular media. While no scripts were extracted, the PDF structure and numerous external links strongly suggest a malicious intent, potentially for SEO manipulation, phishing, or distributing further malware. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://laborke.ru/pbw?utm_term=bts+love+yourself+answer+mp3+download PDF link annotation
    • https://balevogikuvapij.weebly.com/uploads/1/3/5/3/135333961/4456769.pdfIn PDF document text
    • https://lilawowawumoxo.weebly.com/uploads/1/3/1/4/131453384/dewudu.pdfIn PDF document text
    • https://jepejopik.weebly.com/uploads/1/3/4/6/134610321/1b87a9.pdfIn PDF document text
    • https://pevapulef.weebly.com/uploads/1/3/5/9/135979240/5887288.pdfIn PDF document text
    • https://womolikusewafok.weebly.com/uploads/1/3/0/9/130969044/6ed4c89b7cf3b7d.pdfIn PDF document text
    • https://foniliwis.weebly.com/uploads/1/3/2/6/132695455/aa463afd6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427267/normal_6030625953ea6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379613/normal_60bb955f3be53.pdfIn PDF document text
    • https://xelenupexom.weebly.com/uploads/1/3/4/4/134480667/746033.pdfIn PDF document text
    • https://nipujari.weebly.com/uploads/1/3/1/3/131384055/9acf17e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460982/normal_600bfa021a3c3.pdfIn PDF document text
    • https://kajovagej.weebly.com/uploads/1/3/4/7/134747054/5fd8c56a8c.pdfIn PDF document text
    • https://zisidolig.weebly.com/uploads/1/3/1/3/131379992/6769419.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://tomabekaf.pbworks.com/f/addition_subtraction_multiplication_and_division_of_binary_numbers.pdfIn PDF document text
    • http://fatakalewene.pbworks.com/f/70338989180.pdfIn PDF document text
    • http://pazimonofe.pbworks.com/w/file/fetch/144652233/mumujef.pdfIn PDF document text
    • http://zekodunu.pbworks.com/f/who_is_the_best_beat_saber_player_2021.pdfIn PDF document text
    • http://xelivolofuso.pbworks.com/w/file/fetch/144532530/janexarumelomilalabofo.pdfIn PDF document text
    • http://wuranosa.pbworks.com/f/age_of_empires_3_definitive_edition_license_key.pdfIn PDF document text
    • http://bopelijexuf.pbworks.com/f/3655816562.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9C 4532 bytes
SHA-256: 28c551489897e7847f47d5e64c9eeceb58661d8e27ab0edac94f195bafed73d5
font_01_sfnt_off0000faa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA0 5656 bytes
SHA-256: 168e99d2d6a5a49cf803d54434908471dd5bb1dca49a69da3f2e87e797bf20cc
font_02_sfnt_off00010de3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE3 11500 bytes
SHA-256: 7030ac04b0d44f74a43728da9d30082c6859e45f3a9da6f578cd498818b07ff4
font_03_sfnt_off000133ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133EF 16244 bytes
SHA-256: 3af247bf813e594b0975b8ede984bcbf73f6f29be5035c6453e04cca4ecad560
font_04_sfnt_off0001499c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1499C 2792 bytes
SHA-256: 0ae6aaa7f9ff25c9f8375576a0001b294d82a321c4f24c342a5eb47a6f7cea8d

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