Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b4ba54493c0aa7f…

MALICIOUS

PDF

73.5 KB Created: 2021-06-07 06:15:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 6a8e379ef45c073d57fbbb53ac8a647c SHA-1: 3dc48a6118c9ca41277e5a9423ba5e802fa1302d SHA-256: 8b4ba54493c0aa7f35bd0b8b37f7c379f226b80e8823e6f36ff39c5c9d924ccd
186 Risk Score

Malware Insights

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

The PDF file 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 directly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://smidgel.ru/pbw?utm_term=personality+test+questionnaire+pdf PDF link annotation
    • https://kekoluborefox.weebly.com/uploads/1/3/5/3/135327445/natavefazaduvonuku.pdfIn PDF document text
    • https://gitapobukelagij.weebly.com/uploads/1/3/4/2/134266265/venosudewiw_votene_tofogog.pdfIn PDF document text
    • https://zevetokexakap.weebly.com/uploads/1/3/4/6/134640551/kawajupapij-mitubedi-lawisi.pdfIn PDF document text
    • https://fogujudusimasob.weebly.com/uploads/1/3/4/7/134713994/gefomosumumujapu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485004/normal_5fc65d56e1414.pdfIn PDF document text
    • https://bopifodefow.weebly.com/uploads/1/3/4/3/134383970/2f533.pdfIn PDF document text
    • https://zuwumepegowivos.weebly.com/uploads/1/3/1/0/131069935/gotuwaxuxuxus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413457/normal_60459dd167824.pdfIn PDF document text
    • https://zipebamaxotunev.weebly.com/uploads/1/3/2/8/132814247/konosisunisaf-felefude-nomavurixozo-zosisogututokid.pdfIn PDF document text
    • https://jitavemalidev.weebly.com/uploads/1/3/1/8/131871699/4f09c1a42d6d1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390381/normal_60020d8cdf4f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503050/normal_605b5239a140f.pdfIn PDF document text
    • https://bigikudas.weebly.com/uploads/1/3/0/7/130775628/laseketakuno.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368760/normal_60ba68ad76bc7.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/60a57e95-e762-4e2e-af2d-24d8e8af3541/how_much_money_do_navy_seals_get_paid.pdfIn PDF document text
    • http://gufabewa.pbworks.com/w/file/fetch/144577758/fobejisujubisivatufa.pdfIn PDF document text
    • http://kuzimotum.pbworks.com/w/file/fetch/144539541/ferdi_tayfur_benim_gibi_sevenler_filmi_izle.pdfIn PDF document text
    • http://jajafad.pbworks.com/f/75780547423.pdfIn PDF document text
    • http://vawijoj.pbworks.com/f/candy_crush_jelly_saga_mod_apk_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1249b1e-13c5-4e2b-8114-8c1f8a6694b7/98803232725.pdfIn PDF document text
    • http://furalagaposu.pbworks.com/f/31664816705.pdfIn PDF document text
    • http://zemilenasi.pbworks.com/f/sinazisanegoref.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1eab6a03-655f-4d59-9ee8-a32b775d6db4/52790603012.pdfIn PDF document text
    • http://tazijebep.pbworks.com/f/best_buy_return_policy_without_receipt_gift.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0384df58-aa03-448f-8d6d-2aa70405012f/2009_international_property_maintenance_code.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/debe98b2-4742-4808-a805-bdc6e5969466/2387963500.pdfIn PDF document text
    • http://wikoborumun.pbworks.com/f/15164322992.pdfIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e36b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE36B 5264 bytes
SHA-256: a71b3a9c9f617df1d5228badbd4f972b7f34b56b917a7034ed7b67031bc7256f
font_01_sfnt_off0000f566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF566 10192 bytes
SHA-256: 85c7a0a213907c7b3a9ff58a582ef669ff4912009231a09fb2e2a07099811339

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