Malicious PDF — malware analysis report

Static analysis result for SHA-256 78ee5661ed289d8d…

MALICIOUS

PDF

74.4 KB Created: 2021-01-15 04:36:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 2f0aa922ba3821f9746729b4b1cf014a SHA-1: 963ebf059405b33eec1edf1810256d0b31c2ace2 SHA-256: 78ee5661ed289d8d94f37fa639efe3354dd4de173f3806ee6d998ed4c2d993eb
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it contains a link farm and an external URI. The PDF contains embedded URLs, one of which, 'https://traffnew.ru/aws?utm_term=aver+information+vc520%252B', is likely malicious and serves as the primary lure. The presence of PDF-specific heuristics and the nature of the embedded URLs suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • 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://traffnew.ru/aws?utm_term=aver+information+vc520%252B PDF link annotation
    • https://cdn.sqhk.co/tewisifupib/idvoijc/history_definition_computer_science.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387931/normal_5f8e811054f55.pdfIn PDF document text
    • https://jabifuvos.weebly.com/uploads/1/3/1/0/131070291/7221885.pdfIn PDF document text
    • https://site-1167928.mozfiles.com/files/1167928/lost_stories_of_greece_ac_odyssey.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490529/normal_5ff92ed095731.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/cv_template_for_civil_engineering_students.pdfIn PDF document text
    • https://s3.amazonaws.com/bupijila/3500423000.pdfIn PDF document text
    • https://s3.amazonaws.com/puretulenuza/jacoco_report_not_found_jacoco._exec.pdfIn PDF document text
    • https://s3.amazonaws.com/wutezigojuxi/crunches_exercise_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/lofese/free_facebook_cover_page_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/letter_of_recommendation_template_for_visa.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c1a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1A3 5052 bytes
SHA-256: 548a18dc7cf896901c5c58b1aab1240886396eb8cfdbf33cbe711c3eec239fd8
font_01_sfnt_off0000d2af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AF 6528 bytes
SHA-256: d12d679383e5ea9e4e32fc7fa0cf4a79b58e9ebfea40679a15bb3ea2bcc13794
font_02_sfnt_off0000e3f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F4 12312 bytes
SHA-256: b0550d1aaeb122eb63b550f398439276c066f375a2bae52e2dca7c80c1e6f519
font_03_sfnt_off00010cca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCA 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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