Malicious PDF — malware analysis report

Static analysis result for SHA-256 74fab72800c6de7a…

MALICIOUS

PDF

80.6 KB Created: 2020-11-10 10:42:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: f13e041f3f9eaf01c3cc5ef2c07ca21b SHA-1: 7fc26e313d84643ea605d6d03153a6864a82e2f6 SHA-256: 74fab72800c6de7af527ae3c78772fea597ef3fbf78cd2e48cc2618b2092cf06
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of a 'download button' lure further supports a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafficel.ru/strik?keyword=glencoe+mcgraw+hill+english+workbooks+answers PDF link annotation
    • https://xepefebew.weebly.com/uploads/1/3/4/4/134440437/wikumizuvoxo-rawebibutofeb-xuvegadiw.pdfIn PDF document text
    • https://letateworu.weebly.com/uploads/1/3/4/3/134365764/849ba479e318.pdfIn PDF document text
    • https://nixuxani.weebly.com/uploads/1/3/4/4/134433038/jiwabex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368742/normal_5f924d6d6a2c7.pdfIn PDF document text
    • https://kikuvabafot.weebly.com/uploads/1/3/4/3/134332304/gogenalegojopug-biforulageko.pdfIn PDF document text
    • https://biwilodumiz.weebly.com/uploads/1/3/4/3/134319983/takutoguwe-janinot-padinemogari-nelepok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405907/normal_5fa24fd050dba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408703/normal_5f93530283fe6.pdfIn PDF document text
    • https://wibugosavuzatug.weebly.com/uploads/1/3/4/3/134349607/kinunagup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410186/normal_5fa10fe32fa4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384463/normal_5f9398ea151b9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b285846-ada2-4379-b827-ec2761885eed/modoni.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/22084506609.pdfIn PDF document text
    • https://s3.amazonaws.com/suxugipipolazog/voterifogozijid.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_off0000f4d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D6 5540 bytes
SHA-256: dd56d94eb1260a213ee630516d7258d2d3e9d2c450a6c14171b29a0fc5c20868
font_01_sfnt_off00010799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10799 14324 bytes
SHA-256: 7347b5ea171feed34b5432c599f9b353aee0cb197eb30dd651ff8519455463b2

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