Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0febb88e6fb61d9…

MALICIOUS

PDF

74.2 KB Created: 2021-02-14 03:12:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 30182f584dd676b25d989a3ebae4aeeb SHA-1: d3aec5776ec6eadadc4d79b136c82f837bb66efe SHA-256: f0febb88e6fb61d9422a2a3a04ad21c5b03b2b999c1c42f932a6d996323367be
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO spam campaign. The primary URL, https://baarspo.ru/wb?keyword=lagu%20can%20we%20kiss%20forever%20joker, suggests a lure related to song lyrics. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://baarspo.ru/wb?keyword=lagu%20can%20we%20kiss%20forever%20joker PDF link annotation
    • https://jotutavujisab.weebly.com/uploads/1/3/1/1/131164129/6569983.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452217/normal_5fed8ed07a5c2.pdfIn PDF document text
    • https://cdn.sqhk.co/jaselavujuwi/hijih3S/transfer_case_fluid_change_ram_1500.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413119/normal_5fd9b8e9e5cce.pdfIn PDF document text
    • https://fumaletaseker.weebly.com/uploads/1/3/1/3/131381433/lanusaniwad_zolodu_lenuturupa_zisite.pdfIn PDF document text
    • https://cdn.sqhk.co/segexiji/D1hdnhf/pibusaxibegi.pdfIn PDF document text
    • https://dikarofojosej.weebly.com/uploads/1/3/3/9/133988548/tojeraneje_zigidezosig_vufot_wadat.pdfIn PDF document text
    • https://cdn.sqhk.co/movumatoz/hegfvib/president_2020_election_popular_vote.pdfIn PDF document text
    • https://cdn.sqhk.co/savunowudob/4jg4jcm/14291649620.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459324/normal_5fe004d5b1089.pdfIn PDF document text
    • https://gijajagilaz.weebly.com/uploads/1/3/5/3/135313732/7838515.pdfIn PDF document text
    • https://jufozawuvinuxak.weebly.com/uploads/1/3/5/3/135326647/jexan.pdfIn PDF document text
    • https://cdn.sqhk.co/vuzujugasije/y0jbje0/12913812009.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/gonafoziguwewe/3d_model_sketchup_8.pdfIn PDF document text
    • https://s3.amazonaws.com/gedimuta/negovumo.pdfIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/bimone.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
    • 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_off0000c0b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0B1 2944 bytes
SHA-256: a03030c81f151a83b7ae1820ec4911cfd480e6e447b4e0eb26cca44a3f44e583
font_01_sfnt_off0000cb3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB3C 5252 bytes
SHA-256: 95ed0aa63e4899d304b68bb2af765f93bf33315e6e005723f69f436de03c5ec7
font_02_sfnt_off0000dd55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD55 10460 bytes
SHA-256: e8e2cfa472f43260f5ac8887e8c56a24a3489534a0b634f0a8f465ad2740ed7f
font_03_sfnt_off0001012d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012D 17408 bytes
SHA-256: d5880c46bc317681dd80d5a84e5304cf4c3bb022f0b42d3d492f0149dd670aab

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