Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcfdb1365811d659…

MALICIOUS

PDF

100.7 KB Created: 2021-03-22 12:38:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: f1cdcec5c1b4f5e5be448e9c9ed13532 SHA-1: d3efa37585be2890a05df2634eda85d9952a0a02 SHA-256: bcfdb1365811d6590dcae4a771474db91f23baa0ad4a383af855880b3070c608
206 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 0.9998

Heuristics 7

  • 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.
  • 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://gimoguvi.ru/aws?utm_term=full+list+of+jack+reacher+books+in+order PDF link annotation
    • http://xuxuxib.iblogger.org/aiag_apqp_manual_2nd_edition_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466135/normal_600f61f81e7ee.pdfIn PDF document text
    • https://lozugukavokukes.weebly.com/uploads/1/3/4/3/134357100/4426397.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489979/normal_602d54c7a2e63.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479460/normal_603fb6bae76f0.pdfIn PDF document text
    • http://raliwoze.iblogger.org/mappila_album_songs_mp4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417032/normal_603742819dcbe.pdfIn PDF document text
    • http://tixesikixux.mygamesonline.org/bazuxurob.pdfIn PDF document text
    • https://vibofigejud.weebly.com/uploads/1/3/0/7/130740502/katibaf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376375/normal_5ff77095c6ed7.pdfIn PDF document text
    • http://jibesikore.iblogger.org/dimagotifovuvum.pdfIn PDF document text
    • http://wewidarusen.iblogger.org/36022496888.pdfIn PDF document text
    • https://muxudopigudud.weebly.com/uploads/1/3/4/4/134490596/3545962.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ligirewela.epizy.com/hemoglobinopathies_book.pdfIn PDF document text
    • https://s3.amazonaws.com/jupudizadid/61382721022.pdfIn PDF document text
    • http://sadozejeko.myartsonline.com/logo_quiz_world_answers_level_2.pdfIn PDF document text
    • http://wumafopid.onlinewebshop.net/how_to_program_my_comcast_remote_to_my_onn_tv.pdfIn PDF document text
    • https://s3.amazonaws.com/jirebonudur/pugis.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_off00014c4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C4E 5344 bytes
SHA-256: 070f5886c5edda217b9ac2943e3319242496e91de48977373783a61755990d04
font_01_sfnt_off00015e7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E7A 11284 bytes
SHA-256: b0ad88a312a22e3c407160b1ccbb6f54df148029c0716e22ea3d7565a0b96f75

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