Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f752dac980b4120…

MALICIOUS

PDF

76.5 KB Created: 2021-02-28 09:33:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 7b4c6c7f8126d5ad0c901ad7c876b698 SHA-1: 224138831075867eac518267deb9bc208f8a3f9c SHA-256: 0f752dac980b41203688f5a6e606d05ba76f263020169c5744027d5ebeb40a0f
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO spam and phishing. The document body, though heavily obfuscated, suggests a lure related to vacuum cleaner suction, directing users to external sites like 'jottigo.ru'. The presence of a PDF link farm heuristic and ClamAV detection further supports a malicious classification, likely for phishing or malware distribution.

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://jottigo.ru/award?keyword=which+roomba+has+the+best+suction PDF link annotation
    • https://loguxofe.weebly.com/uploads/1/3/0/7/130775118/jojixijawosinolurowi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453102/normal_5fe076bf17557.pdfIn PDF document text
    • https://nunipotewisi.weebly.com/uploads/1/3/4/8/134892443/3193424.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401538/normal_60275f5709e9a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408002/normal_5feb476a56950.pdfIn PDF document text
    • https://cdn.sqhk.co/bodujemep/g6Ughif/37574092746.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407060/normal_5fd32f0801ff9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366668/normal_5fd6798600c6a.pdfIn PDF document text
    • https://vulopinuvi.weebly.com/uploads/1/3/1/1/131164419/dulonegumezesu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373526/normal_602ebc87c8119.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449766/normal_5fde50c2752a8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bumurulepowele.myartsonline.com/indian_cookbook_author_madhur_jaffrey.pdfIn PDF document text
    • http://tomijejimener.epizy.com/55956556835.pdfIn PDF document text
    • http://tofujuwo.onlinewebshop.net/63888089075.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_off0000f159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF159 5160 bytes
SHA-256: 268c301c1bf4e20ef629bc17259be3693a6686bba760c54e6a4e2eab9cabbbdc
font_01_sfnt_off000102c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C3 10076 bytes
SHA-256: 8e9c2b6b3b2f6c456fb0f6ac5508c81007ca98ca09f0465c17c16fc53d80e718

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