Malicious PDF — malware analysis report

Static analysis result for SHA-256 74c5006e91d5ab53…

MALICIOUS

PDF

68.1 KB Created: 2021-03-28 08:57:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 561d52cc7c49db0067cef58c6c479d6d SHA-1: 2e86ade0431dcd98ca4134f42ff6e7dab28e5127 SHA-256: 74c5006e91d5ab533d4d064b2c89b2d8463e19bcf48da2a56aea6c6beb6f5f02
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDFs, indicating a link farm or SEO manipulation tactic. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to potentially malicious or unwanted content, possibly as part of a phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 4

  • 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://leonvi.ru/award?keyword=signal+integrity+characterization+techniques+pdf
    • http://lenuvivureropi.scienceontheweb.net/zefipuxituzexekojir.pdf
    • http://hq-cleartv.info/1-_99_construction_guide_rs3_2017n9v9g.pdf
    • http://gixipures.sportsontheweb.net/adhesive_bonding_process.pdf
    • https://cdn.sqhk.co/detatakev/eTpPjfr/pumpkin_karver_movie.pdf
    • http://arendagg.xyz/how_do_you_report_an_experimentd2vu1.pdf
    • https://cdn.sqhk.co/duzupafuj/djjggc7/66140314930.pdf
    • http://mosuxuvemuzuwex.mywebcommunity.org/42293771905.pdf
    • http://energierecrute-emplois.com/starbucks_partner_guide_2019f9cvo.pdf
    • http://stav-games.ru/adhd_screening_toolsh8bmc.pdf
    • http://abwaab.su/627040333176gx1t.pdf
    • http://jenuxijaf.mygamesonline.org/baby_einstein_neptune_jumper_age.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ec08fec6-e576-400d-8504-372613838d3c.filesusr.com/ugd/57e0ce_cd03ca5d7cae48098e2f579c0cac4abc.pdf?index=true
    • https://3e1ae61b-6b68-46dc-8a90-d1c7a5b9f91c.filesusr.com/ugd/b8bbd7_3d8b2286870645dcb9793d08b16a1737.pdf?index=true
    • https://170a7d3c-74f0-42f5-9ead-98ae292a4922.filesusr.com/ugd/a18aa6_0ae6732d92404fb0ace5fc4eff010fbb.pdf?index=true
    • https://8e12fe21-47c1-448c-af9e-883e7c84523b.filesusr.com/ugd/52ac5e_28bc1eae610c493e8c460b6247a529fa.pdf?index=true
    • https://6e229dea-1f83-4be8-8cd3-388eabd4f5e3.filesusr.com/ugd/1cfe37_eca0088172244bce834924097e4e6e44.pdf?index=true
    • https://0eb00d84-361a-45dc-b346-1af5c8eb785c.filesusr.com/ugd/d79848_ef2560419cbe4af488d6d380b1618837.pdf?index=true
    • https://12dd324c-696b-4d67-8c19-991f3eacec2c.filesusr.com/ugd/eeb7bd_fdacaa48c51b4c278b37436ef66b43a4.pdf?index=true
    • https://s3.amazonaws.com/muvojugejoxip/what_is_meant_by_seasonal_produce.pdf
    • https://fa90eb46-aa9b-4fd1-a2e8-e903ec8e50a4.filesusr.com/ugd/575fb0_a1710b549a0f4c1dbcaffa6fd404b8fc.pdf?index=true
    • https://s3.amazonaws.com/nojemi/2014_chevy_ss_owners_manual.pdf
    • https://s3.amazonaws.com/muvazi/how_much_do_a_sandwich_bag_weigh.pdf
    • https://011f98f8-b45f-4578-a2fd-466b530f7845.filesusr.com/ugd/74e905_574b37de1f8a4ddbbf36919368bc82b1.pdf?index=true
    • https://5926284e-b61c-4ed0-95e5-27b9feedd2c3.filesusr.com/ugd/50c35f_a21a919134684bcc93b8ae4f6c787b7c.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_off0000cbed.bin
d0397a33816cc24d20204844735caeab3e1a4d309cfca6d8c4ee584cab609aa2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCBED 5796 bytes
font_01_sfnt_off0000dfad.bin
c29971cf2fdc0dfbb7dda8bd9cbe1424e6de264b36d06bf44f2924e406c1365e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAD 10256 bytes

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