Malicious PDF — malware analysis report

Static analysis result for SHA-256 70c13996bd07cca3…

MALICIOUS

PDF

85.6 KB Created: 2021-03-15 21:07:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: b0aac4b495a902e079ad1e3c1468342e SHA-1: 471dd64230495663de91dbf42b83f1d0353d3aa2 SHA-256: 70c13996bd07cca30b2274185fd39d60916eb75b581ac0a568d4abd22ea1bd9c
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to disposable hosting and employing UTM parameters, indicative of a link farm or SEO manipulation scheme. ClamAV and ML classifiers identified the file as malicious, specifically flagging it as Pdf.Phishing.Trojan. While no scripts were directly extracted, the presence of embedded URLs and the heuristic firings strongly suggest an intent to redirect users to potentially malicious sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://bologen.ru/aws?utm_term=vegan+breakfast+quick+meals PDF link annotation
    • https://jukuxalubena.weebly.com/uploads/1/3/1/4/131453985/5605124.pdfIn PDF document text
    • http://dududuw.mypressonline.com/samsung_galaxy_note_10_user_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/fenazijeguk/ggQM45P/vezidenusolok.pdfIn PDF document text
    • https://cdn.sqhk.co/xutujipux/jg7ajI2/xokatelalijovezanigodedu.pdfIn PDF document text
    • http://sejerodetupumil.medianewsonline.com/zen_mind_beginner_s_mind_suzuki.pdfIn PDF document text
    • https://duxoberadu.weebly.com/uploads/1/3/4/7/134718286/lakolowisujopiroti.pdfIn PDF document text
    • http://kemikavar.mypressonline.com/coenzyme_q10_benefits.pdfIn PDF document text
    • https://cdn.sqhk.co/lisesemafo/7jhJgjL/zabudimusakitekotuxuluxij.pdfIn PDF document text
    • https://cdn.sqhk.co/dufolatik/hIidiiL/73955291254.pdfIn PDF document text
    • https://bokowamimufap.weebly.com/uploads/1/3/2/7/132712050/7d119d121e.pdfIn PDF document text
    • https://senidexug.weebly.com/uploads/1/3/0/7/130775540/2768586.pdfIn PDF document text
    • https://bepewosub.weebly.com/uploads/1/3/4/4/134445398/soluwa_bezilakutatomow_xuminur.pdfIn PDF document text
    • http://tezibif.mygamesonline.org/how_to_find_volume_of_a_cone_given_diameter_and_height.pdfIn PDF document text
    • http://tijudozi.scienceontheweb.net/dojusimawurinifufitigaxo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/44c2d0b6-5735-402d-b188-460831c01f16/why_is_my_maytag_washer_not_working.pdfIn PDF document text
    • https://4eb83289-b313-4542-b68c-79a1d4783db4.filesusr.com/ugd/f6336d_576f32a998f64e98adf919ca5537a534.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/488fd2b4-a743-4661-b0cc-32b0bb688f62/how_do_you_reset_a_verizon_mifi_7730l.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/270f163d-cb4b-4246-a722-cd1d31050f2b/how_do_i_create_my_own_website_from_scratch.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c79e2ca-795b-4026-beca-2511c8af2e54/what_to_do_when_he_disappears_and_comes_back.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dce30be4-d131-4748-82c8-00f05de56d8b/towebewubanefegajunugidob.pdfIn PDF document text
    • https://82656f1f-dd0f-4426-89ca-c5688288f975.filesusr.com/ugd/56de54_4e4c73dc48cb431f91c62a3fc131875a.pdf?index=trueIn PDF document text
    • https://45dcde1a-aed5-4138-b95e-a0f768a283bf.filesusr.com/ugd/89441e_da513c6a3fe448c6b3b81d54f108470b.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B6 5496 bytes
SHA-256: a5e33fba0f5019386d3040825ee54338b259f0d3f036cd01942559d26f14b374
font_01_sfnt_off00010c65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C65 11580 bytes
SHA-256: c7aaa01672026b197c54eccc6789a328b0034f05a2698b47de88d51def7c568d
font_02_sfnt_off00013372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13372 16340 bytes
SHA-256: ee51351c9eb8c6a9dbff1bb743467f39bbaa64eee970481c040e8f02c1ffc4b8

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