Malicious PDF — malware analysis report

Static analysis result for SHA-256 50a6b94d04fbd65b…

MALICIOUS

PDF

108.0 KB Created: 2020-12-25 12:40:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: d8c2864e1e56abc5353a00d5f494b955 SHA-1: 07adc353e4c8ebe710dd59effa3f34c71a911ab3 SHA-256: 50a6b94d04fbd65bd65dd7d21361b01c84b8fff5e9ee19ed65d5a047d08962a4
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, identified as a link farm, with a UTM parameter suggesting tracking or redirection. The ClamAV detection and ML classifier strongly indicate maliciousness, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffset.ru/strik?utm_term=dog+runner+cable+kit PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4475985/normal_5fc2644597a00.pdfIn PDF document text
    • https://lufavipipoj.weebly.com/uploads/1/3/4/5/134580953/1079162.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443608/normal_5fa1086ca0991.pdfIn PDF document text
    • https://rikidunojig.weebly.com/uploads/1/3/4/4/134488605/0691fa8599a.pdfIn PDF document text
    • https://dagigokes.weebly.com/uploads/1/3/0/7/130739756/nodifogenimawo.pdfIn PDF document text
    • https://fijojonibiw.weebly.com/uploads/1/3/2/6/132681787/a8401ec7a9859.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/ratefunerod.pdfIn PDF document text
    • https://bepugodaz.weebly.com/uploads/1/3/4/2/134236138/3102725.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/64f098d9-d578-46c8-9ce3-138bf16edb20/sivibuw.pdfIn PDF document text
    • https://s3.amazonaws.com/fasotajedag/plazma_burst_forward_to_the_past.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a642e343-c2e3-4bd2-b82c-cbd5cd9f7fb4/78741635676.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e23bb8c-c85f-4e3b-abad-6fe3192e2aff/62333622943.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b84fb1b3-cd2d-45b9-9d1b-8163a438d0d1/8543667447.pdfIn PDF document text
    • https://s3.amazonaws.com/bojafazes/hbr_guide_to_dealing_with_conflict_powerpoint.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015bdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BDB 3220 bytes
SHA-256: 49cc9cbdc25711050fcd4f33f5cda9bf21e2142aae7ab0899e423122c9289fd4
font_01_sfnt_off00016750.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16750 4992 bytes
SHA-256: 6e9b8a0282403e1925f9c167ec0c8a6236bc20b14aa60140fff18b4d40d4075d
font_02_sfnt_off00017865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17865 12320 bytes
SHA-256: 6683fcbdfe9f23a16e7ab00eba52f481d95c01203238e8644cb24e882ca62fad

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