Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f5a78249843946e…

MALICIOUS

PDF

73.3 KB Created: 2021-03-01 20:00:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: b89bed945169eb62f0fe427efd269d0b SHA-1: 9a20deb05f1901544a24e56b7f0d33f96c866454 SHA-256: 7f5a78249843946ef0533c3b10fa0b231347417a0dbeb0f707bb9695c9629669
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many hosted on disposable domains, suggests a link farm designed to redirect users to malicious content, likely for phishing or malware distribution. The document body, though heavily obfuscated, contains text related to legal objections, reinforcing the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://zajinet.ru/award?keyword=california+objections+to+deposition+subpoena PDF link annotation
    • http://nuxemuxexajimo.22web.org/brady_labelmark_5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417033/normal_5feaf26f6592b.pdfIn PDF document text
    • http://woziwowariv.sportsontheweb.net/53514551861.pdfIn PDF document text
    • http://medebupima.sportsontheweb.net/xukewisulapufe.pdfIn PDF document text
    • http://dosubodanes.mypressonline.com/50395099769.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485943/normal_6009901919109.pdfIn PDF document text
    • http://kivudutamazawan.22web.org/7th_grade_math_worksheets_integers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473656/normal_600d08016f0ff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448549/normal_5fed95c5bcc5f.pdfIn PDF document text
    • http://bogplaktnc.fun/7381282261y4ay3.pdfIn PDF document text
    • http://xomunuxeju.sportsontheweb.net/amplifi_tt_pc_software.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zubiluwetij.myartsonline.com/first_90_days_in_leadership_role.pdfIn PDF document text
    • http://kakasis.onlinewebshop.net/sevubowobolijeroxedemole.pdfIn PDF document text
    • http://bodegifu.atwebpages.com/polycom_soundstation_2_non_expandable.pdfIn PDF document text
    • http://xaviwawav.epizy.com/dodilufuvazek.pdfIn PDF document text
    • http://fujesotes.epizy.com/lenovo_g50-80_touchpad_drivers_for_windows_7_64_bit.pdfIn PDF document text
    • http://xumusuriwo.rf.gd/liledatobos.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_off0000e40b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40B 5268 bytes
SHA-256: be0b5fd714d75edf0f4d8243fdc91d443e6ebc5695b590ba5fa3615090fe1ef1
font_01_sfnt_off0000f5ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FF 9860 bytes
SHA-256: 23fadac3823e8a9def7d29e26d325c16a9c0b3b328253476de6000d81fbab6ea

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