Malicious PDF — malware analysis report

Static analysis result for SHA-256 76a5e13878a64a4d…

MALICIOUS

PDF

90.4 KB Created: 2021-03-18 06:51:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: a1a22b1d3025b776e1d09b680c36bd9f SHA-1: e77a2b1c7e7d29b11c43f7770689f3a2a6bcaea3 SHA-256: 76a5e13878a64a4dfc5351fff5b9d5947b2c2d13d63c227a8457a12c7309fc8a
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xezojetit.ru/123?utm_term=anaconda+2+hd+full+movie+tamil PDF link annotation
    • https://cdn.sqhk.co/mipekakiri/a5hKhkK/83785766886.pdfIn PDF document text
    • https://cdn.sqhk.co/zururodi/c9iigev/1328104253.pdfIn PDF document text
    • http://majelogajizivo.iblogger.org/53192376780.pdfIn PDF document text
    • https://cdn.sqhk.co/tajixixejafi/hOhjhd1/sky_sports_events_calendar.pdfIn PDF document text
    • https://cdn.sqhk.co/nexasolonit/4hfMajb/mapabijotomuxi.pdfIn PDF document text
    • https://bovatukal.weebly.com/uploads/1/3/0/7/130739183/5444700.pdfIn PDF document text
    • https://lekikibobasiva.weebly.com/uploads/1/3/5/3/135350768/sojapok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465941/normal_5fd785544dbd3.pdfIn PDF document text
    • https://lefelovavuj.weebly.com/uploads/1/3/4/6/134644752/1115308.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371514/normal_6000ca419cd23.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/00367a56-9555-4a2c-9310-833440214a07/que_es_un_manual_de_organizacin_empresarial.pdfIn PDF document text
    • http://lemefatunim.rf.gd/jovidibobadimosavujiwazu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b42329a-e573-4c5b-9c5e-b13f3407790b/mixomagigo.pdfIn PDF document text
    • https://s3.amazonaws.com/dowadotiju/vebela.pdfIn PDF document text
    • https://s3.amazonaws.com/nimuwet/78004614988.pdfIn PDF document text
    • http://kekabifaku.rf.gd/tojarasijo.pdfIn PDF document text
    • http://bedozev.rf.gd/wexovitesenezavepukop.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_off000116ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116EC 3780 bytes
SHA-256: 595abfdfa5978714b52ecddec54c7ffcbd66c70a57b2aa8067d431c91397125f
font_01_sfnt_off00012442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12442 5168 bytes
SHA-256: 8480355d61f6616c7d706fe38465f7b14e5d8176db021609c973972c8c97dbc8
font_02_sfnt_off000135bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135BF 11380 bytes
SHA-256: 91f5b7cad10d1843348cf4b924746a3043251190de67449ed587af53e2efc1d4

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