Malicious PDF — malware analysis report

Static analysis result for SHA-256 0943f39dd6eb9ca4…

MALICIOUS

PDF

79.9 KB Created: 2021-05-11 06:05:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: da80c122f63dc0d68b3f1534c492203d SHA-1: 41722d1fac67855e3a8ed3c00fc90ae4c88ffb0f SHA-256: 0943f39dd6eb9ca4a062725ee3939be2ea606a171c0da195781896767ddffe03
186 Risk Score

Malware Insights

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

The PDF contains a lure related to fixing a hard drive, which is a common tactic for phishing or malware distribution. It includes numerous external links, many hosted on disposable domains, suggesting a link farm designed to obscure the ultimate destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://baarspo.ru/strik?utm_term=how+to+fix+failing+hard+drive PDF link annotation
    • http://laserisesiseno.getenjoyment.net/in_taberna_carmina_burana.pdfIn PDF document text
    • https://temazojirilezin.weebly.com/uploads/1/3/2/3/132302863/namorogetovovefoxixa.pdfIn PDF document text
    • http://bafiselavanebep.mywebcommunity.org/56773568105.pdfIn PDF document text
    • https://bilunoxenaxu.weebly.com/uploads/1/3/4/4/134474733/fefe611.pdfIn PDF document text
    • http://jerimujolegem.medianewsonline.com/bangalore_university_time_table_2020_bcom.pdfIn PDF document text
    • http://jivavesomuviz.getenjoyment.net/70424551329.pdfIn PDF document text
    • https://sadavixiji.weebly.com/uploads/1/3/5/3/135333995/8958a3ac.pdfIn PDF document text
    • https://nokuzase.weebly.com/uploads/1/3/4/7/134765685/runafuzezoge-tojawe.pdfIn PDF document text
    • https://xuserufibizu.weebly.com/uploads/1/3/4/1/134131258/punoweru.pdfIn PDF document text
    • http://wozekozexufoxol.scienceontheweb.net/esv_study_bible_download.pdfIn PDF document text
    • http://crubr.space/cerumen_impaction_guidelinesazgaa.pdfIn PDF document text
    • http://silekutum.medianewsonline.com/arabic_quran_in_english_letters.pdfIn PDF document text
    • http://dhl-order.info/68789593644fgsmk.pdfIn PDF document text
    • http://pinerapidsrr.com/924447158384fjwh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vizegemawokaxe/pivafozepumuledijal.pdfIn PDF document text
    • https://4b523d79-2bc6-404f-8e52-0acae4d2cb03.filesusr.com/ugd/fe1b41_46d0c6297f5c48eb90d0b9f7e7cf3849.pdf?index=trueIn PDF document text
    • http://nabenejajoko.myartsonline.com/32915866465.pdfIn PDF document text
    • https://s3.amazonaws.com/tisegovofu/antigua_passport_application_form.pdfIn PDF document text
    • https://s3.amazonaws.com/kubafezin/nuzikuli.pdfIn PDF document text
    • https://aa3bb5c3-2bd4-4791-9e2a-6e31d5009b04.filesusr.com/ugd/60e703_7f63ee4521fe4b28929057c5a46d9134.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zopenave/30213867631.pdfIn PDF document text
    • https://20128683-61eb-4207-b985-d468b1a81fea.filesusr.com/ugd/0049ca_e87011efcd5342d8b796b325dacf693d.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fcdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDD 5172 bytes
SHA-256: 9fcc6d5c68da867fafb615b6f2e4437c7ae6956ee7ef09222e897ea974c40ba7
font_01_sfnt_off00010e86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E86 10520 bytes
SHA-256: 957bd08e843868abc7f5551fcfa58c9b593da4ed9caae75427531ef0ff129d58

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