Malicious PDF — malware analysis report

Static analysis result for SHA-256 85f221321a68e76f…

MALICIOUS

PDF

80.2 KB Created: 2021-06-09 02:41:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 6a3e68c2aa6180902ad476872fd2423f SHA-1: c2b1f89029476c35d5114fea1c01424fc3b22a32 SHA-256: 85f221321a68e76fb020aa6d389ab512d6cce55748ee990711e957f78438941b
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users to potentially malicious content. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The presence of embedded URLs and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://ketchas.ru/pbw?utm_term=the+darkest+minds+2+pdf PDF link annotation
    • https://felunazajejo.weebly.com/uploads/1/3/5/9/135959991/9952991.pdfIn PDF document text
    • https://bejixoradagox.weebly.com/uploads/1/3/4/3/134314707/f1a5195323872.pdfIn PDF document text
    • https://xeromikivato.weebly.com/uploads/1/3/2/6/132695960/2657e7f2b674667.pdfIn PDF document text
    • https://zujogomute.weebly.com/uploads/1/3/1/4/131483029/743b5426a79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457298/normal_6057d03479b7f.pdfIn PDF document text
    • https://jaligudupu.weebly.com/uploads/1/3/5/3/135391073/88d9faeb860.pdfIn PDF document text
    • https://pewofofuvalok.weebly.com/uploads/1/3/0/7/130775386/naligomubusasozik.pdfIn PDF document text
    • https://xizilajonufu.weebly.com/uploads/1/3/4/5/134528384/326efe865471a0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488133/normal_601bfc9499008.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456666/normal_60baedd20bff2.pdfIn PDF document text
    • https://jebeniwuzopud.weebly.com/uploads/1/3/4/7/134707819/5572653.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4368752/normal_60b63f69957a1.pdfIn PDF document text
    • https://boxoxezerutevok.weebly.com/uploads/1/3/4/3/134317212/kezepolelanonumirur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388406/normal_5fe801e525bd2.pdfIn PDF document text
    • https://pitulero.weebly.com/uploads/1/3/2/6/132683003/zesasedumem.pdfIn PDF document text
    • https://balalowomave.weebly.com/uploads/1/3/0/7/130738893/308341.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mikabipi.pbworks.com/w/file/fetch/144718569/what_is_the_strongest_cheese_in_the_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/908c8a0e-6d82-427a-8121-d1c3379ec517/what_is_the_meaning_behind_the_phantom_of_the_opera.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f66e4a20-e90c-429a-b434-ec2a3fe0566a/what_to_do_when_your_panasonic_tv_power_indicator_blinks.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2241805f-1c0a-4cc8-885b-5cd0f07bcac8/char_broil_gas_grill_burner_adjustment.pdfIn PDF document text
    • http://jabevexizoj.pbworks.com/f/91900111807.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b7f567a-c6df-4b8c-9d07-721e0705c170/kevufanegesezofigarirezov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c362768f-88b5-4597-aff1-10a8ce1ae633/8262887701.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_off0000fb01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB01 5396 bytes
SHA-256: 724d848cd8ef59901473f2152628f024a006babd3a06592fe69c9116377d8406
font_01_sfnt_off00010d2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D2E 11492 bytes
SHA-256: 938c2bc2e24cfe1db2c3ea91e680e64adbbe9fb62109de9a1e11f2c780684bed