Malicious PDF — malware analysis report

Static analysis result for SHA-256 468861173b8dc9ef…

MALICIOUS

PDF

97.8 KB Created: 2021-04-23 03:37:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b731121b50f07ea95fbb49dae2aea8bd SHA-1: 81c2f50ed1fa060c3d3f356a821946e5a5725f4c SHA-256: 468861173b8dc9ef39b4a3e16e3781f2e6799d9b99f0722d4924e17aa1bed8c1
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • 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 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://jacksth.ru/strik?utm_term=angel+care+vet+clinic PDF link annotation
    • https://cdn.sqhk.co/ragebobeb/Ssiehhp/rapozerapop.pdfIn PDF document text
    • https://lavowoluxep.weebly.com/uploads/1/3/5/3/135388351/9307401.pdfIn PDF document text
    • http://setafugeridol.scienceontheweb.net/cardiovascular_system_diseases_and_disorders.pdfIn PDF document text
    • https://cdn.sqhk.co/zukuxenopo/0yjihar/grow_idle_archer_apk.pdfIn PDF document text
    • https://xawuwotogot.weebly.com/uploads/1/3/2/6/132695388/2003356.pdfIn PDF document text
    • https://cdn.sqhk.co/jidelugob/aRpYegj/32967019711.pdfIn PDF document text
    • https://wavenugila.weebly.com/uploads/1/3/4/8/134852162/8c66a0b1fe45e.pdfIn PDF document text
    • http://dezowem.medianewsonline.com/wivevo.pdfIn PDF document text
    • http://gujozulogisin.scienceontheweb.net/58873662395.pdfIn PDF document text
    • https://cdn.sqhk.co/jofutagi/mLsjaVO/art_of_war_legions_cheats.pdfIn PDF document text
    • http://ziposodepow.mywebcommunity.org/non_homogeneous_differential_equation_examples.pdfIn PDF document text
    • https://cdn.sqhk.co/ragojagef/hegdt5F/dessert_recipes_without_butter_or_milk.pdfIn PDF document text
    • https://zoforofutesabuw.weebly.com/uploads/1/3/4/7/134751738/resor.pdfIn PDF document text
    • http://midikakuvekume.mywebcommunity.org/59619220658.pdfIn PDF document text
    • http://manuximaxemeje.scienceontheweb.net/xetenisaxabeluxop.pdfIn PDF document text
    • http://tapidiv.medianewsonline.com/mdu_b._ed_syllabus.pdfIn PDF document text
    • http://wamuwosola.mygamesonline.org/microsoft_az_103.pdfIn PDF document text
    • http://mesanezedid.mypressonline.com/english_alphabet_worksheets_for_grade_1.pdfIn PDF document text
    • https://cdn.sqhk.co/zolokike/jhgcqmU/kaxup.pdfIn PDF document text
    • https://cdn.sqhk.co/zenetofuma/hahejfp/the_legacy_golf_course_phoenix_arizona.pdfIn PDF document text
    • http://delozofize.scienceontheweb.net/astm_b117_16.pdfIn PDF document text
    • https://fefedajukuda.weebly.com/uploads/1/3/1/0/131070841/8d08cce65.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011b42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B42 4840 bytes
SHA-256: bbfcefa013e684bacabb4854f0a24e35663c190c3e9ed0afeb5ecc0f11fa448e
font_01_sfnt_off00012bcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BCD 4072 bytes
SHA-256: f1c813b8ce2c11d3c0f41e2b38694433c861042ea96cc91fa3d4719e2f44ea08
font_02_sfnt_off00013ab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AB3 11256 bytes
SHA-256: 7ddf17edc86c11dd77b839004153b9190e92a5395731d9d428f949f1f3621f77
font_03_sfnt_off00016132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16132 17320 bytes
SHA-256: 8ac3a71740b2369b61fa00e30d3a3ab8d4c7c92c114536d489de4137b693ba88