Malicious PDF — malware analysis report

Static analysis result for SHA-256 0957c52110f8a74d…

MALICIOUS

PDF

66.9 KB Created: 2020-11-18 00:39:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c3965ed3b72fbdc451c9210437b1dadc SHA-1: b398f1afe9c8750774f576c0cacbbdeeebafcdb3 SHA-256: 0957c52110f8a74d1812b0f2069aed86cb951be49504d6aae7a8683a32cfd5d6
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. One of these links, https://trafffe.ru/123?utm_term=boyce+differential+equations, is flagged as unknown reputation, suggesting a malicious intent. The ML_NYX_PDF_MALICIOUS and ClamAV detections further support the malicious classification. While no scripts were explicitly extracted, the structure and heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=boyce+differential+equations
    • https://kololeranazi.weebly.com/uploads/1/3/4/5/134583506/rifuzol.pdf
    • https://moxetutatag.weebly.com/uploads/1/3/4/2/134234950/tavawa-lijugapasidala-womuliruziled.pdf
    • https://narukomoforu.weebly.com/uploads/1/3/4/3/134320250/xafodumog_fitedu_manupedufawuluj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3dac9f11-6544-479c-8d16-b9ddb59f3051/14138528431.pdf
    • https://uploads.strikinglycdn.com/files/849d092f-33dd-4fc7-a4d3-e94fb6396035/55610483958.pdf
    • https://uploads.strikinglycdn.com/files/969b49eb-ee10-42f5-9c58-4048cb0dac00/62544367485.pdf
    • https://uploads.strikinglycdn.com/files/0addfe98-4d81-48de-be33-0f03b489a96e/vafibelujaxituwenevirata.pdf
    • https://uploads.strikinglycdn.com/files/313a1f93-bb21-49b4-a4c0-76759a6ec3a8/sim_card_cloner_software_free_download.pdf
    • https://uploads.strikinglycdn.com/files/c0e50280-a2e7-42cb-a313-3ea2fb75e35d/75657569655.pdf
    • https://s3.amazonaws.com/gowebabuxogiro/wedepewi.pdf
    • https://uploads.strikinglycdn.com/files/f8ea0a18-b729-450a-8824-8d148a0dca7a/white_pill_with_l374_on_it.pdf
    • https://uploads.strikinglycdn.com/files/df0ef5b5-0375-4f57-9149-1485c3691587/37890535466.pdf
    • https://uploads.strikinglycdn.com/files/24bf3148-f50b-4f26-9004-0459389c1421/lyrics_lead_me_guide_me_elvis_presley.pdf
    • https://uploads.strikinglycdn.com/files/3e5ef966-8349-42c4-b146-c4413eb51e77/87083595298.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9c8.bin
f6708716c3e4e861804b4a6129fcdfd0a4fa553a17674d32b850c5848eddbb54		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C8 5292 bytes
font_01_sfnt_off0000dbe2.bin
23d2fb63f941c1c0572325c7fba5e278bb34473e0e0f8b21df0718af40fd5297		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE2 10264 bytes

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