Malicious PDF — malware analysis report

Static analysis result for SHA-256 c411a7970c76a0f9…

MALICIOUS

PDF

72.6 KB Created: 2021-02-18 12:08:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 1eda1b991f5ac5b950a022232d50de25 SHA-1: a5464557ef445da281ea4854e8cc803b32204d8c SHA-256: c411a7970c76a0f945a6866d513d58147877a820742d072421b3c118e6592c52
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, and an external URI points to a suspicious URL with UTM parameters. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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/strik?utm_term=axial+scx10+jeep+wrangler+unlimited+rubicon+parts PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387709/normal_60104968111c0.pdfIn PDF document text
    • https://worijuxadije.weebly.com/uploads/1/3/4/8/134863955/kelowadup_tavebapizezij_sexipi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443341/normal_6018aff1bb9f0.pdfIn PDF document text
    • https://cdn.sqhk.co/nemisova/qijmmjj/46178933990.pdfIn PDF document text
    • https://cdn.sqhk.co/kowetitemaro/9RiaVhj/mokaluxopewu.pdfIn PDF document text
    • https://bijawodit.weebly.com/uploads/1/3/4/8/134883407/e131f50.pdfIn PDF document text
    • https://fekawuzode.weebly.com/uploads/1/3/5/9/135993312/salupebesibulixuv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411916/normal_5fe590314b86b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455898/normal_601bdd3c589b9.pdfIn PDF document text
    • http://toguvuveleguna.22web.org/noxasurig.pdfIn PDF document text
    • https://bopilopuneliniw.weebly.com/uploads/1/3/5/3/135304065/xovifesumij.pdfIn PDF document text
    • https://cdn.sqhk.co/kufusivekogo/jgzxs9o/40477732313.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450440/normal_5fe0c37f5d32e.pdfIn PDF document text
    • https://cdn.sqhk.co/rasepotobami/aIXQRn4/fadetefagekedobab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369494/normal_5ff470bdcb541.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xuxusemo.epizy.com/physical_inventory_count_sheet_meaning.pdfIn PDF document text
    • http://nigowona.rf.gd/chrome_for_windows_7.pdfIn PDF document text
    • https://s3.amazonaws.com/dusined/7089498321.pdfIn PDF document text
    • https://s3.amazonaws.com/pazerogasarinu/chromecast_app_for_mac_free.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_off0000db09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB09 5952 bytes
SHA-256: c58caed68c2268f67e7cc428110159e0851a9d25d8424ca0567ed7f10b827bd2
font_01_sfnt_off0000ef4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4C 11104 bytes
SHA-256: 785ffef76f728bb35e54033cbdc3ab959c154db9d0c78c55b61a988bfe1f4b4a

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