Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9569b3943c5fbc6…

MALICIOUS

PDF

76.2 KB Created: 2021-04-10 02:49:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: a16387a9b60e3b7f0f4a3a83dd056e27 SHA-1: 36be24e4560f667808e4058c0c4365053174d2f2 SHA-256: c9569b3943c5fbc64c1b44df0d0ce1e7a3a554b4e0e4ff00a69918228e9c8810
146 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including ML classification and ClamAV detection as a phishing trojan. The document body, though truncated, suggests a lure related to product reviews, while the heuristics explicitly point to a callback phishing or tech-support scam pattern. The presence of embedded URLs and link farm activity further supports the malicious nature of the document, likely intended to redirect users to malicious sites or initiate fraudulent contact.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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=baby+trend+sit+n+stand+double+stroller+reviews PDF link annotation
    • https://vamolitewule.weebly.com/uploads/1/3/4/6/134670516/zugag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457005/normal_6011ad6f2adf1.pdfIn PDF document text
    • http://fesumebujurasa.22web.org/ifs_google_sheets_between.pdfIn PDF document text
    • http://shoppermarket.online/why_is_my_heat_not_workinguzrdr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453103/normal_5ff7f844495d7.pdfIn PDF document text
    • http://alcozerox.com/what_predominant_intermolecular_force_is_in_ch3ohpsce7.pdfIn PDF document text
    • http://faceskinagainbeauty.xyz/the_essentials_of_computer_organizataeyte.pdfIn PDF document text
    • https://birobidusizal.weebly.com/uploads/1/3/4/6/134638138/e1fa1.pdfIn PDF document text
    • http://deutschebank-meine.com/61342776073993op.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469847/normal_605d16adef79c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470821/normal_606b7b0646c5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459466/normal_60637acdab3d3.pdfIn PDF document text
    • http://sisonigoban.iblogger.org/tally_accounting_tutorial_free_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377933/normal_600831a900a53.pdfIn PDF document text
    • http://thedouche.xyz/dls_2018_logov2q8e.pdfIn PDF document text
    • http://nubolutlion.xyz/burning_sensation_in_skin_on_legs0hn77.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388421/normal_600bb677b4dac.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gigirisezox.rf.gd/fujakejegukudexupuvova.pdfIn PDF document text
    • http://rugogifaruniru.rf.gd/epoxy_adhesives.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_off0000ead5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD5 5260 bytes
SHA-256: 28c7cdc375edc8c01cdd11a9b9d6cfe043a1593f7e90f98042480628345b193e
font_01_sfnt_off0000fcdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDB 11400 bytes
SHA-256: 874d44b2da6248e5ab199bfe5aea45c539034aa4660551e7ab24eb1c6017cc09

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