Malicious PDF — malware analysis report

Static analysis result for SHA-256 12a4eedfe149d786…

MALICIOUS

PDF

114.1 KB Created: 2021-04-05 21:03:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0f2e660e1e03c06eb7d1375473e6734d SHA-1: deb5b16fb935846fb7218a038d6e4ee0fc6d419b SHA-256: 12a4eedfe149d78623644f451630e6146e8ce3ee1ad875f9a3d3022696b3f8ba
156 Risk Score

Malware Insights

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

This PDF sample was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The document contains a large number of external links, many of which point to other PDFs hosted on file-sharing services, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest it may be used to redirect users to malicious sites or download further payloads, potentially via embedded JavaScript.

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://leonvi.ru/award?keyword=geological+time+scale+pdf
    • https://koxowuberes.weebly.com/uploads/1/3/1/3/131379375/degujizafu.pdf
    • http://ostanni.fun/influencer_synonyme_frxs9mj.pdf
    • https://xivovawa.weebly.com/uploads/1/3/4/8/134875493/90cb2e3489ed4.pdf
    • http://maximizator.online/pet_shop_master_rio_pequeno0mom3.pdf
    • http://tlgfree.xyz/ludovico_einaudi_seven_days_walking_sheet_musicf0xct.pdf
    • https://nogovomavidel.weebly.com/uploads/1/3/1/6/131637041/7155695.pdf
    • https://besugadofozoxi.weebly.com/uploads/1/3/5/3/135396803/suxupudarukoni_pebokopavaxipof.pdf
    • http://tufepuwaw.iblogger.org/dd_3.5e_monster_manual.pdf
    • http://kieverts.xyz/korg_electribe_ea-1_mk2yp585.pdf
    • http://burrrhey.tech/79490922805n9kgj.pdf
    • http://xapidomin.mywebcommunity.org/autocad_2020_user_guide_free_download.pdf
    • http://olymptrade.buzz/my_genie_reviewsg63ry.pdf
    • https://gigexozokup.weebly.com/uploads/1/3/2/6/132695408/zewogonitodop.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://321e46d8-a3e9-4523-905f-b0dcd1dcb7ef.filesusr.com/ugd/29fbc3_f9d869fbd1df49d3bb357066229ac1ed.pdf?index=true
    • http://kivozusemu.atwebpages.com/what_is_the_maximum_weight_for_a_baby_car_seat.pdf
    • http://soripijadob.rf.gd/segmentos_de_la_arteria_cerebral_anterior.pdf
    • http://gagugitebuf.atwebpages.com/asciidoc_tutorial.pdf
    • https://c183b790-cb34-49aa-848e-1a9f2b14dda3.filesusr.com/ugd/d8966e_3567aa6cec8b4587995977c6d96be43e.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_off00017f74.bin
274a12ed4184ec5cedb17fcb8e24d7d18c3fd55c952ce78ecb3dc3878ea8e0b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17F74 5408 bytes
font_01_sfnt_off000191d8.bin
5d3fc0c88f4d5945fdddf7bdbcfc13c95d62dd4be91a4201f62797bdb0444d46		 pdf-font-stream PDF embedded font (sfnt) at offset 0x191D8 12140 bytes

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