Malicious PDF — malware analysis report

Static analysis result for SHA-256 3467635217ed8037…

MALICIOUS

PDF

89.2 KB Created: 2021-01-06 14:01:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d88234635a3fee9a55eb41a5bb486833 SHA-1: de74677251deb2a01f3fda819669adf6258f6acd SHA-256: 3467635217ed80378674818ddaa9da5cb2bba646f8ecc67971edf3f3e44f18a8
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of numerous external URLs points towards a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafficel.ru/123?utm_term=physics+definition+list+spm
    • https://maxuvejalova.weebly.com/uploads/1/3/4/2/134265339/zajuvizagugobi.pdf
    • https://bafizotadax.weebly.com/uploads/1/3/4/7/134761596/4876090.pdf
    • http://www.opentle.org
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wokesabisevo/boxawesomuj.pdf
    • https://s3.amazonaws.com/jadudusujuje/locating_places_with_latitude_and_longitude_worksheet.pdf
    • https://uploads.strikinglycdn.com/files/3e9e99c5-1271-456c-a405-0c151c86a71a/how_to_enable_cheats_in_kotor_2.pdf
    • https://s3.amazonaws.com/daxemo/making_decisions_case_studies_worksheet_answers.pdf
    • https://uploads.strikinglycdn.com/files/037c0a4c-6931-488f-ad26-e868929a5409/37393654709.pdf
    • https://uploads.strikinglycdn.com/files/e1908fa1-b83e-45e5-b44c-01df639dc119/cubasis_2_manual.pdf
    • https://uploads.strikinglycdn.com/files/2ee23859-1975-4d83-9b23-18d6ea31f211/lagitikozotiva.pdf
    • https://uploads.strikinglycdn.com/files/7b6e955c-3449-4fbc-b266-4ec0579db9ca/horizon_forbidden_west_trailer_2.pdf
    • https://uploads.strikinglycdn.com/files/8343c2c6-9cab-4893-ad7d-8b73ae8ebacc/division_in_church.pdf
    • https://uploads.strikinglycdn.com/files/b006da35-42e9-4832-b027-42d7a1ab40aa/original_oratory_speech_topics.pdf
    • https://uploads.strikinglycdn.com/files/f94f0859-9677-4b29-88ea-05ccf532f974/bejasu.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://www.gnu.org/licenses/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00010e7c.bin
cde1c90ee0dd81dca4de8d9578e72b9409d2843c047af5e5a0dacc2f081d5f1e		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10E7C 12932 bytes
font_00_sfnt_off0000fcee.bin
ccdfdee93864193da9f51c4282e999ec4dab32b889941e39c9ace692d2aeebbb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEE 5192 bytes
font_02_sfnt_off000132f2.bin
96aaf7563fc3777dafb4cdf59c7c5293bf1a1bcb9add845d532bb6e3262e453d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x132F2 10736 bytes

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