Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc85baf74e910cee…

MALICIOUS

PDF

67.1 KB Created: 2021-02-04 13:32:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: afd332d306c88ed4e437bdfa4fc0946c SHA-1: 37e8fe7d35eb3569be1cc2cead8063f4adc38e58 SHA-256: cc85baf74e910ceeadf14a8878c0651a31aaa710ba667d2155415cc68e45788c
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier, indicating a high probability of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, appears to be a lure related to a 'Boss gt-100 manual'. No scripts were extracted from this sample, but the presence of numerous external links points towards a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/aws?utm_term=boss+gt-+100+manual PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4368750/normal_5ffed5636c8f4.pdfIn PDF document text
    • https://tigibivimibi.weebly.com/uploads/1/3/4/3/134344299/8000039.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375210/normal_5ff7147ec4607.pdfIn PDF document text
    • http://fallofelin.online/vofikigirpesem.pdfIn PDF document text
    • https://tibiwurab.weebly.com/uploads/1/3/2/6/132695994/ca26dab90.pdfIn PDF document text
    • https://fupotepalakeb.weebly.com/uploads/1/3/5/3/135351483/vakobitisad.pdfIn PDF document text
    • https://sulomotosepotu.weebly.com/uploads/1/3/4/7/134744650/nerulazigilejo_zivedub.pdfIn PDF document text
    • https://wirolarem.weebly.com/uploads/1/3/1/6/131636642/gabuserusugebodotusu.pdfIn PDF document text
    • https://buxexemap.weebly.com/uploads/1/3/4/8/134890763/5361185d.pdfIn PDF document text
    • http://yoga-fitness.space/lototusadulujetudukobopa99gpw.pdfIn PDF document text
    • https://ruxunomitebapat.weebly.com/uploads/1/3/1/6/131606858/3875968.pdfIn PDF document text
    • http://naturfresh.fun/samsung_pay_apk_for_galaxy_watch6pr1k.pdfIn PDF document text
    • https://jadufebifov.weebly.com/uploads/1/3/4/6/134627690/0ba7efc.pdfIn PDF document text
    • https://famutogerene.weebly.com/uploads/1/3/4/6/134688643/82886fddb195f76.pdfIn PDF document text
    • http://pl50off.info/dragon_skyrim_weaknessw0u67.pdfIn PDF document text
    • https://zanirifut.weebly.com/uploads/1/3/1/4/131407922/giril.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486215/normal_600ef4fdce52c.pdfIn PDF document text
    • https://dijuwinepogiw.weebly.com/uploads/1/3/0/7/130738679/ccafe389b89ba8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476268/normal_6007e3ca561a1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/savukojubusum/grok_learning_all_answers.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC700 5184 bytes
SHA-256: c3e478c471af2ea43714274eec5783f8542196cc4a13e98239355880b5c87fb1
font_01_sfnt_off0000d8a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8A7 10972 bytes
SHA-256: e606bdabe33dddd25bd99700709cda71df1dfbae9309a146d0cc153dccdf30cf