Malicious PDF — malware analysis report

Static analysis result for SHA-256 b79086ea970443a6…

MALICIOUS

PDF

91.2 KB Created: 2021-02-28 20:32:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 15373cd288c98928bdf3e0562c01c2a1 SHA-1: 18552ce5ae27aed3867556557f47fdbf3a4d1b3c SHA-256: b79086ea970443a692932fb348d94e310aa380525d4e0cc85ea23eb9ab579db4
66 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 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 0.9998

Heuristics 4

  • 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://mezovuduw.ru/123?utm_term=singer+5560+fashion+mate+sewing+machine+review PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4470979/normal_6016298ddc456.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384145/normal_5fd17dbf390d8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369663/normal_5fee92a7ebed1.pdfIn PDF document text
    • http://cocobeautybar.ca/vidmate_old_version_2._28_for_iphonewgc18.pdfIn PDF document text
    • https://zatemolepilud.weebly.com/uploads/1/3/6/0/136085897/gonomezo-lafupogebo-nakinufumuwe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449776/normal_5fe2e1f5bc752.pdfIn PDF document text
    • http://1xbet-registrat.site/bavisopu9z6yr.pdfIn PDF document text
    • https://ruwizugaxuluba.weebly.com/uploads/1/3/4/7/134759804/bakokevexanu.pdfIn PDF document text
    • https://doxemikawapuki.weebly.com/uploads/1/3/4/3/134314999/b21ab9b1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376120/normal_60314e7f16f8a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/muxozuvalubi/best_morning_alarm_ringtone.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11879 5724 bytes
SHA-256: b5ff1d416ab7d5683966722af084c9a47b431ceca4f1c991765c1cfc00cb1d9a
font_01_sfnt_off00012bdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BDD 11112 bytes
SHA-256: 8297a6e285d3b198ba6e244e3bc616f76e8021839f94941ac29d2d68b12ac17b
font_02_sfnt_off000151ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151BA 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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