Malicious PDF — malware analysis report

Static analysis result for SHA-256 98357eb2dd528986…

MALICIOUS

PDF

79.0 KB Created: 2020-12-27 05:23:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 5c4608438309117e87b02b1ce4e54ea0 SHA-1: 3eebd1f1bc7d333dfa639d9f1dff8890b437a0ed SHA-256: 98357eb2dd5289865238ebaab5d135f77d930b650a592e9df96a67979fde717a
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to manipulate search engine results or redirect users to malicious sites. The ClamAV detection and ML classifier further confirm its malicious nature, flagging it as a phishing trojan. While no scripts were extracted, the presence of numerous external URLs indicates a likely attempt to lead the user to a compromised or malicious website.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://trafftec.ru/strik?utm_term=pool+light+bulb+color+changing PDF link annotation
    • https://cdn.sqhk.co/sepufaziru/r3mhfk8/shot_clock_ella_mai_lyrics.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372753/normal_5f9ec0c481606.pdfIn PDF document text
    • https://cdn.sqhk.co/tipefimex/UFOOEf9/stormfall_saga_of_survival_para_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/numanazolov/0jbNd6c/open_laparotomy_and_bowel_resection.pdfIn PDF document text
    • https://walijogopabo.weebly.com/uploads/1/3/0/7/130776167/davozewubonoda-fatotaside-vaxuxa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413469/normal_5fce9a1290b81.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412905/normal_5fce7d0a23185.pdfIn PDF document text
    • https://zivejopoji.weebly.com/uploads/1/3/4/2/134266783/zelaja.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416918/normal_5fddc2c2965dd.pdfIn PDF document text
    • https://cdn.sqhk.co/tesikotuk/ihhdijS/17873511285.pdfIn PDF document text
    • https://nitetezelimon.weebly.com/uploads/1/3/1/4/131438651/vinirofevikuni_gonebirorox_degutatabij_jerisitab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423442/normal_5faa72f44a830.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426262/normal_5fa5e63713190.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411252/normal_5f9e76bcb561c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f7ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EC 5024 bytes
SHA-256: e9894152ba0db50363282b96066e69c18d52d856e423d22ccbf2350edea0bce4
font_01_sfnt_off000108fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FD 11304 bytes
SHA-256: 2f6314aa6235ced3ab56061dbb8cb4d1c5ace7b5acca051fce1cbe69ea2909b8

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