Malicious PDF — malware analysis report

Static analysis result for SHA-256 a957a0f1693e45a1…

MALICIOUS

PDF

67.3 KB Created: 2021-01-18 05:47:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: a4241c6668fdff791a468fe714d99d7b SHA-1: ebb7653a2ca8dee4bc502546f8cedd7ad1cdcc01 SHA-256: a957a0f1693e45a1318d88580fa55ee7eabc5079f438e31005265265073cf1d5
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, suggesting it's part of a link farm designed to redirect users to potentially harmful websites. The presence of 'utm_term' in one of the URLs further supports the idea of tracking user engagement for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffe.ru/123?utm_term=polaris+sportsman+500+owners+manual PDF link annotation
    • https://site-1168027.mozfiles.com/files/1168027/kenasisowiga.pdfIn PDF document text
    • https://cdn.sqhk.co/zofizitene/EjfOCRg/airtel_dth_recharge_plans_rajasthan_2019.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500430/normal_5ffc565d27dc0.pdfIn PDF document text
    • https://wepugimi.weebly.com/uploads/1/3/1/0/131070973/bizerokiva.pdfIn PDF document text
    • https://cdn.sqhk.co/lewivapawo/kgghhea/luvirarugex.pdfIn PDF document text
    • https://ruregogawumol.weebly.com/uploads/1/3/2/8/132815787/4169328.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453732/normal_5fa819f9e91e0.pdfIn PDF document text
    • https://cdn.sqhk.co/numokafas/Hjj9yij/99726849318.pdfIn PDF document text
    • https://site-1174986.mozfiles.com/files/1174986/46867457753.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463277/normal_5fc04bc3c4819.pdfIn PDF document text
    • https://site-1167931.mozfiles.com/files/1167931/ikea_black_friday_2018_romania.pdfIn PDF document text
    • https://site-1172723.mozfiles.com/files/1172723/final_freeway_2r_review.pdfIn PDF document text
    • https://site-1212439.mozfiles.com/files/1212439/341976253.pdfIn PDF document text
    • https://zimegusak.weebly.com/uploads/1/3/4/6/134605775/digowil.pdfIn PDF document text
    • https://site-1176273.mozfiles.com/files/1176273/54465084342.pdfIn PDF document text
    • https://cdn.sqhk.co/wepurodapike/cidjegc/minecraft_mob_texture_pack_1._14.pdfIn PDF document text
    • https://cdn.sqhk.co/gufadiviw/agghjib/7329174054.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376101/normal_5fed645c52a47.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
    • 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_off0000beac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEAC 5208 bytes
SHA-256: 645e40cedebe2cfd0612de82a11d814b57689da474b6d7831e6b94acfad70248
font_01_sfnt_off0000d04f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD04F 9808 bytes
SHA-256: fd61117408dfea9577afa044730004811a51dcdcd5bd3ae1f16c76788959f9d1
font_02_sfnt_off0000f1f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F5 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

Open this report in the interactive analyzer, or submit your own file for analysis.