Malicious PDF — malware analysis report

Static analysis result for SHA-256 aec19f12eb7e4364…

MALICIOUS

PDF

71.4 KB Created: 2021-06-07 05:16:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: e3362dac026c7a5b2ef25df44edb84f1 SHA-1: c91bc76b1519dd710e9c68cf24123caaaacc9153 SHA-256: aec19f12eb7e4364f020ba699dcedba81eeaac1532fd6f7c320f45bec6a87f36
186 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. 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 0.9997

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://archism.ru/pbw?utm_term=discrete+math+and+its+applications+7th+edition+solutions+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4447631/normal_60218b11282de.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502248/normal_5ffc0d1ac7f11.pdfIn PDF document text
    • https://wukavuzadit.weebly.com/uploads/1/3/0/7/130776823/eadaf0f.pdfIn PDF document text
    • https://litazivufili.weebly.com/uploads/1/3/4/3/134305244/xanebod.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383449/normal_601be1258fb2d.pdfIn PDF document text
    • https://lorajezaked.weebly.com/uploads/1/3/4/3/134367433/kojukukepadibagaw.pdfIn PDF document text
    • https://faxigokoge.weebly.com/uploads/1/3/0/7/130775726/5674616.pdfIn PDF document text
    • https://punopisa.weebly.com/uploads/1/3/7/5/137516802/7886fb6ff48d44b.pdfIn PDF document text
    • https://mufirurinonezu.weebly.com/uploads/1/3/4/6/134669904/8368aebaedd8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411691/normal_5fc7f4ce9339a.pdfIn PDF document text
    • https://kimonasisu.weebly.com/uploads/1/3/5/4/135400987/0acc546e5a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368469/normal_600da51491f1f.pdfIn PDF document text
    • https://kinamolifurepe.weebly.com/uploads/1/3/2/7/132710726/salizumarusometamume.pdfIn PDF document text
    • https://limofagis.weebly.com/uploads/1/3/4/6/134640762/kepitunovug.pdfIn PDF document text
    • https://vuvitolivudiru.weebly.com/uploads/1/3/2/7/132712253/varajegituxemi_vimivesexi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407810/normal_6054e4fff3aa5.pdfIn PDF document text
    • https://finamiwowekizo.weebly.com/uploads/1/3/2/3/132302732/202752.pdfIn PDF document text
    • https://femomupine.weebly.com/uploads/1/3/4/4/134458898/2203939.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/abeb1710-d15d-435a-bc85-cde9dd9bec20/77640935322.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1aa5113d-0cc7-4f81-ac97-db26f9ce8deb/oxford_textbook_of_interventional_cardiology.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_off0000d9e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E3 5472 bytes
SHA-256: 7ef50ba3c65dc3f77d3173f4dbf76ce5e4a3b3ec819096234c7f89f2caa1be1d
font_01_sfnt_off0000ec61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC61 10500 bytes
SHA-256: 05e125e8a5dd7b5b81c65e9be74e60eb2f6c7edb048bffe8e9c951705c545925

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