Malicious PDF — malware analysis report

Static analysis result for SHA-256 1443fc70ad4bad29…

MALICIOUS

PDF

76.7 KB Created: 2021-03-15 15:55:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f71e54a4ecd874ba1f0571af708bec7c SHA-1: 87d6e57643cc8305d3c81ef2d0fee643d7d72535 SHA-256: 1443fc70ad4bad291a0893a6e96f1cd742ed31e75347367f507b055c39f6a052
146 Risk Score
Tags
free-cdn-ebook-manual-lure

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. It uses a callback-phone (TOAD) lure. 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 0.9999

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 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://vilenefex.ru/wix?keyword=the+daily+stoic+pdf+espa%25C3%25B1ol+gratis PDF link annotation
    • https://kidepexabosu.weebly.com/uploads/1/3/4/2/134266059/boxigisuda-bidexaferokasos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369501/normal_602d1c64a4483.pdfIn PDF document text
    • https://panofokolonap.weebly.com/uploads/1/3/4/4/134483377/6260816.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479938/normal_60495808d427a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494888/normal_5fe8b9e4db8e3.pdfIn PDF document text
    • http://tudeboroxope.22web.org/what_is_a_visual_learner_called.pdfIn PDF document text
    • http://razajegusut.22web.org/halo_3_armor_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498702/normal_6035de60a772e.pdfIn PDF document text
    • https://pawimugonuri.weebly.com/uploads/1/3/4/8/134882006/lularokajafun_pitimexi_lulibo_vugekirodefo.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/vabemavuputenif/plushie_tycoon_game_guide.pdfIn PDF document text
    • http://manugefax.epizy.com/vilojuboxowilamameso.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d639b02-248e-433a-af7a-67760c533459/1649473335.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf984d6f-4eb6-4829-88b0-68853ba44ed5/rosed.pdfIn PDF document text
    • https://s3.amazonaws.com/jagux/sample_format_of_balance_of_payment_account.pdfIn PDF document text
    • https://s3.amazonaws.com/lixisariwulo/8828220711.pdfIn PDF document text
    • http://tejujusaruke.epizy.com/words_meaning_in_english.pdfIn PDF document text
    • http://rojetakaju.epizy.com/how_to_crochet_for_beginners_step_by_step.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DD 5680 bytes
SHA-256: 799c104944b25cf69a4e762a995eb737b570e6f3aa480cee4c4fc7a0d2f294d9
font_01_sfnt_off0000fbf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF3 12404 bytes
SHA-256: 0149cd4f4b986cc25bf00f079f35cad7e5a223103ae193f6ae0c7275b1dd2e95

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