Malicious PDF — malware analysis report

Static analysis result for SHA-256 d95b20ba12696ed0…

MALICIOUS

PDF

71.2 KB Created: 2021-03-17 22:51:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b37eb92a25b3c3d862e60a61930c3ebc SHA-1: e903a56974e4ad1e3d976b35beaad33f4f1fa7b2 SHA-256: d95b20ba12696ed099da6b41934c54daa355903ac2561d6f1a16704a46d6ee75
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic, suggesting it is part of a link farm. The ClamAV detection and ML classifier flagging confirm its malicious nature, likely as a phishing or malware distribution vector. The embedded URLs point to various PDF files, some of which are hosted on suspicious domains, indicating a potential distribution mechanism for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://pelibifir.ru/award?keyword=third+person+singular+verbs+worksheet+pdf
    • http://perevod24-card2card.site/72835299944g8lod.pdf
    • http://autokenn.com/7261679104nh2q7.pdf
    • https://static.s123-cdn-static.com/uploads/4444864/normal_5fec4094debbf.pdf
    • https://cdn-cms.f-static.net/uploads/4456687/normal_600cfc0a2022a.pdf
    • http://vinnipoh.space/allen_heath_sq7_manualu1hx1.pdf
    • https://cdn-cms.f-static.net/uploads/4383928/normal_600cf3863a146.pdf
    • https://cdn-cms.f-static.net/uploads/4457881/normal_6028783fc8f81.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://35b1a599-9f45-4897-82ce-59a931fc5495.filesusr.com/ugd/daca0d_3dab8ed2c5ad4fb684d17dbd5fb593f5.pdf?index=true
    • https://s3.amazonaws.com/xazarujokemus/fesewifafiwoxugezi.pdf
    • https://s3.amazonaws.com/tawovojo/are_propane_tankless_water_heaters_worth_it.pdf
    • https://8860adff-7f0b-4cf3-a358-cdd560dff136.filesusr.com/ugd/625844_2c85675944ad459ba2142feb1ea1b86b.pdf?index=true
    • https://s3.amazonaws.com/libowebujakux/68401087865.pdf
    • https://s3.amazonaws.com/sowewazulejewi/crest_bronze_award_student_guide.pdf
    • https://s3.amazonaws.com/ninazarila/long_multiplication_worksheets_year_6.pdf
    • https://559ef5b4-38f4-491c-95f5-a6f57f0534fb.filesusr.com/ugd/1b862a_9c6a1875fe3a4fac8e7ced955aa61772.pdf?index=true
    • https://s3.amazonaws.com/sigobija/67167957921.pdf
    • https://d0f5cf02-e55f-42e7-ba97-8a4d5a2b8368.filesusr.com/ugd/7f59a0_cfb69d83ec404642bb8ba54072165de1.pdf?index=true
    • https://s3.amazonaws.com/wifiduxezo/fuxiref.pdf
    • https://c7f0abc7-d23b-482d-bd16-0771495bb668.filesusr.com/ugd/bb13a2_df28c21bf3b844ee88458908cae9d7e8.pdf?index=true
    • https://a0d2adcf-75bd-42a9-a42a-c23e1c6e9e1a.filesusr.com/ugd/85c99c_21e17c5a5c514a24b4b8120a433a5872.pdf?index=true
    • https://s3.amazonaws.com/gedesisumi/gofaropa.pdf
    • https://dc273c12-e125-4738-b2e6-b96bc4bd5eb7.filesusr.com/ugd/c8df25_24ebadda0fdd49d49b3fe764a8a1e1e6.pdf?index=true
    • 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_off0000d6ab.bin
d1e4c0a012a4eb669bded70dd19d236fb271310289a9c563fc80e44b6bf164e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AB 5608 bytes
font_01_sfnt_off0000e9cb.bin
706a310cbacb276fba9455597b2a26738d14b52cfed410324f33d3a7a9e913e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CB 11240 bytes

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