Malicious PDF — malware analysis report

Static analysis result for SHA-256 39141ad05b62c504…

MALICIOUS

PDF

106.5 KB Created: 2021-03-19 05:51:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 721b7bee468e633c9d616a56358b0e80 SHA-1: 3250e3dbef502525a4b21bcdfd12e23cb638d872 SHA-256: 39141ad05b62c504616ed380fdd1ac0303d60b34720595165432c63043e33c5d
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards an attempt to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://nipisod.ru/wix?keyword=demag+pk+chain+hoist+manual
    • https://cdn.sqhk.co/mibajufaneja/6hejaUP/lafisulurufurezi.pdf
    • https://finoritibad.weebly.com/uploads/1/3/4/4/134468058/8140877.pdf
    • https://cdn.sqhk.co/zagusebipin/ihiiFhj/94991322700.pdf
    • https://cdn-cms.f-static.net/uploads/4383688/normal_603d7d393d4d1.pdf
    • https://static.s123-cdn-static.com/uploads/4476135/normal_5fec133f4c5b7.pdf
    • https://sulekigotama.weebly.com/uploads/1/3/4/3/134307446/d41ef846580de38.pdf
    • http://xojitufos.66ghz.com/bloodborne_board_game_rules.pdf
    • https://cdn-cms.f-static.net/uploads/4369509/normal_60506efe33faa.pdf
    • https://cdn.sqhk.co/merojuniv/giE435Q/98314209384.pdf
    • https://static.s123-cdn-static.com/uploads/4480735/normal_5fefe4301e212.pdf
    • https://cdn.sqhk.co/dabozijide/KQhdggj/65519938938.pdf
    • http://pofitasexa.iblogger.org/24574230628.pdf
    • https://jotozorofelafik.weebly.com/uploads/1/3/1/4/131405965/nikisa.pdf
    • https://kujegafibez.weebly.com/uploads/1/3/4/2/134265926/57ce183938ee1c.pdf
    • https://static.s123-cdn-static.com/uploads/4480412/normal_5fe207f6d7a96.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e2e7ccd7-796f-4570-8b65-ab0ee1b75074/letra_de_twenty_one_pilots_stressed_out.pdf
    • https://2a082fd4-e93f-4b8e-9e59-408fa046b31c.filesusr.com/ugd/e334dd_bcfd52ad4f57413d870d6802b3608bb2.pdf?index=true
    • http://dipulitexaxuz.epizy.com/armonicos_en_la_red_electrica.pdf
    • https://46c0acaa-de7d-4f46-84f0-c2cf1d8ff7d9.filesusr.com/ugd/ac1638_d864bdf0c1e741758f7a597a2cf71c0b.pdf?index=true
    • http://jaxudemavi.epizy.com/how_do_i_use_speed_dial_on_my_lg_flip_phone.pdf
    • https://c7bff75e-0a19-4817-9d47-fca4cf08161b.filesusr.com/ugd/3b6424_4d24c628382c47ee8584130c802e8209.pdf?index=true
    • http://bagegamejejupu.epizy.com/shrek_movie_gif.pdf
    • https://uploads.strikinglycdn.com/files/802ac293-18ad-45b2-a0da-e9af718ff26e/how_to_hold_a_violin_for_beginners.pdf
    • https://uploads.strikinglycdn.com/files/6343d2fe-d568-48cb-949b-7e3c896bfad1/51422567811.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://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014a75.bin
cc1088c5376f34f4900f4fc37a6d8b8fdc4963f95a264cd514fd81a6d3347508		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14A75 5312 bytes
font_01_sfnt_off00015c6e.bin
1060e166b525d634576493201dec0405a2739479a2751799cb1743aa98330104		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15C6E 12564 bytes
font_02_sfnt_off0001873e.bin
96855e3231f1f84b0549504a79103f5c68aff579f57c61e3e8c115302fd915aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1873E 16128 bytes

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