Malicious PDF — malware analysis report

Static analysis result for SHA-256 dab4c5d16bb786d8…

MALICIOUS

PDF

90.1 KB Created: 2021-03-21 04:04:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a3a9a1678dadb52b51aa13840013d534 SHA-1: d227b5ca8d5b25ce9bb7c720d0edfa8aaea40e4d SHA-256: dab4c5d16bb786d87bbf5fe4fd9f74ee62dbc32f5ef528ccfd2065286d3b6994
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a malicious intent to redirect users to potentially harmful content or for SEO manipulation. The ClamAV detection and ML classifier strongly indicate maliciousness. While no scripts were directly extracted, the PDF structure and numerous external URLs are indicative of a phishing or content-luring scheme.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/award?keyword=tujuan+agama+islam+pdf
    • http://cparta.moscow/how_to_pair_with_alpine_cd_receivermvlvs.pdf
    • http://italywow.space/tugonis65d2.pdf
    • http://xviiivbgz.com/90199369210jghzc.pdf
    • https://cdn.sqhk.co/setuboluraje/15ggzig/35488060987.pdf
    • http://lnstagram-help-businesss.com/uppababy_mesa_car_seat_jake_vs_jordanvhnly.pdf
    • https://cdn.sqhk.co/vatuliwa/igygegj/61855714896.pdf
    • https://sugokumorol.weebly.com/uploads/1/3/1/4/131437576/ba076f4.pdf
    • https://ganaletikuwefe.weebly.com/uploads/1/3/4/3/134306697/zurezifasok-nojakipub-fubifurenimux.pdf
    • http://ig-mediateam.net/67777660737ay9hu.pdf
    • https://gupovokezatiku.weebly.com/uploads/1/3/4/8/134878629/2192fcc.pdf
    • http://bristol-yalta.run/kifakajic1sz.pdf
    • http://ig-copyrightviolation.com/world_war_z_game_trophy_guidexu6wq.pdf
    • https://cdn.sqhk.co/disumuneriva/jjby9HH/rerexamuzilijamoloje.pdf
    • https://cdn.sqhk.co/vobipibomuk/ijm5Bxj/40379957501.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e020cfd2-8e0a-400e-a515-81f1b041bf9c/gabuxuvojijofuno.pdf
    • https://uploads.strikinglycdn.com/files/14d4c788-d223-4efb-938d-cec980860095/mesa_dual_rec_rev_g.pdf
    • https://uploads.strikinglycdn.com/files/abbd3723-c06f-4903-a263-25dad610cb6a/thermodynamics_book_for_chemical_engineering.pdf
    • https://uploads.strikinglycdn.com/files/5902692f-29fe-40d7-bd4d-4cdcf3a479b0/namebufibibopa.pdf
    • https://uploads.strikinglycdn.com/files/51538e42-64f6-4a78-a409-22cd62278bf7/16511446161.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001315d.bin
1817c45c5d1a97bb3fc98fff94275196b6f67de844346bfbf23aaddedb518148		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1315D 23272 bytes
font_00_sfnt_off0000fa2a.bin
95e4468585f3e45b6e3b64ade19564fe30e90e7528bc38cc3f8bb6b0456838c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2A 5288 bytes
font_01_sfnt_off00010c23.bin
f2bd6a1d6cf178951c9fef654cd29e9b1acff6194908efa61b1181355662bc85		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C23 10880 bytes

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