Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3ca23bebc147192…

MALICIOUS

PDF

78.0 KB Created: 2020-11-18 21:45:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 74aec57a6dd9f8b6c759e43e5da423c2 SHA-1: 4f1a1bc4b13bf339d39abc48feec3534bae14f7d SHA-256: d3ca23bebc147192f114766f4b154ae17f4505ac3f90c974f9979325697f6da6
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The primary URL, 'https://trafffe.ru/123?utm_term=pasay+city+zip+code+fb+harrison', suggests a phishing or spamming campaign. While no scripts were explicitly extracted, the presence of numerous external links and the ML classifier's high confidence score indicate malicious intent, likely related to directing users to malicious sites.

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://trafffe.ru/123?utm_term=pasay+city+zip+code+fb+harrison PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367311/normal_5f8e1b465b7f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486523/normal_5faa30f32be5e.pdfIn PDF document text
    • https://risimukino.weebly.com/uploads/1/3/1/3/131383953/2178010.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393186/normal_5faa28bc8bc34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459481/normal_5fafdc19d53a4.pdfIn PDF document text
    • https://rudofodirofebas.weebly.com/uploads/1/3/0/7/130739781/8554501.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370299/normal_5faddae8dd33f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415081/normal_5f9bd1d35033d.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/wipotegadodorek/ramadan_2020_dates_iraq.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2149d6c2-58f1-4eaa-bdf1-d0fff22f898a/litolononuf.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_off0000f3f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F7 5504 bytes
SHA-256: d37f73dd9c89f9218fde0484c2fcfae85f3fb3cc694caf162a860cd454297781
font_01_sfnt_off000106b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B0 11240 bytes
SHA-256: 233a782072a99760f882306b6212354a17d73316e3bee72bce579c4dbfb394b2