Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d30b381766b05e5…

MALICIOUS

PDF

80.8 KB Created: 2020-11-18 18:28:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: b0254aab8552bf671b6ba83d5e18deed SHA-1: 72960b14a201e6fc03a1a3796e572db9d92fb755 SHA-256: 3d30b381766b05e5603072724f4850375d91e4d208f780e8b24cd7b0dd66d47c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a large number of external links, with one prominent URL pointing to 'trafficel.ru', suggesting a link farm or phishing lure. The document body is heavily obfuscated and contains metadata from wkhtmltopdf, but the primary malicious activity appears to be directing users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafficel.ru/123?utm_term=spirit+guard+udyr+price PDF link annotation
    • https://ribafiligizeki.weebly.com/uploads/1/3/1/4/131438260/lofozan.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/b66e7638-2150-41f8-9a41-07517dd03321/72432617607.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56280d68-f80a-47f5-b58a-e0f24295a2d6/avast_premier_activation_code_2038.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b337c541-1656-4d92-9048-e1955849e7ed/cellular_respiration_vs._fermentation_venn_diagram.pdfIn PDF document text
    • https://s3.amazonaws.com/degagaziv/kotizopitimogugawalelaba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a186cf70-1caf-4cd6-97f8-f65911cf8885/criminal_minds_characters_hogwarts_houses.pdfIn PDF document text
    • https://s3.amazonaws.com/lodazojamuva/83140949012.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24925975-f5c2-47ab-8cff-db8c72dcb697/bizuvenapafifetabofu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a22af171-2618-4ab6-b683-21ce135e21a7/difuvasumulexozagigur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66c2788b-0581-49c1-af7f-fb816a2e4bd7/20336286283.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b397ec2-0b1e-4b08-8b32-599e929f6449/wukurelesetexidag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/623a90d8-699f-4d6b-bd6e-5f351bc7389f/string_notes_on_ukulele.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_off00010217.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10217 5236 bytes
SHA-256: 77854c88f159a53ecea886b63c3940edbd158856c30c560bc0f19c03e052e5f9
font_01_sfnt_off000113fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FE 10440 bytes
SHA-256: 43dcd6347acd24ac5aa4a44124aed5c676e8be8961bd482511b916456cdc871d

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