Malicious PDF — malware analysis report

Static analysis result for SHA-256 a77140af90184c88…

MALICIOUS

PDF

88.0 KB Created: 2021-06-01 08:01:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: c524738da2ebad35010d760b24333580 SHA-1: 2416f25e87cb9529c0e3a36a835b849f45c3af34 SHA-256: a77140af90184c88697487909125f70153fcc286cf15a3f793c3258397772a81
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with one prominent URL pointing to 'allytemp.ru', suggesting a phishing or malware distribution lure. The PDF structure and embedded content, though heavily obfuscated, are consistent with attempts to redirect users to external, potentially harmful, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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 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://allytemp.ru/pbw?utm_term=latest+ppsspp+gold PDF link annotation
    • https://lolefisad.weebly.com/uploads/1/3/5/3/135344485/5607205.pdfIn PDF document text
    • https://fejejupusojovif.weebly.com/uploads/1/3/1/4/131483068/ff5251ead.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4457563/normal_60b0481ed7e2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450042/normal_606ca154536ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495400/normal_6011313505cf4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427300/normal_5ff4f62072abf.pdfIn PDF document text
    • https://gawopina.weebly.com/uploads/1/3/2/8/132814119/panakakodalu.pdfIn PDF document text
    • https://xojenupikubola.weebly.com/uploads/1/3/4/7/134747345/8844714.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469828/normal_5fe84234a9515.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374848/normal_6023325e96087.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369773/normal_6023605da8391.pdfIn PDF document text
    • https://dinuboxisoxim.weebly.com/uploads/1/3/1/8/131857966/jubomavapirudoju.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feteselulo.pbworks.com/f/88200283472.pdfIn PDF document text
    • http://lakebimutep.pbworks.com/w/file/fetch/144424563/48503755136.pdfIn PDF document text
    • http://visetululiv.pbworks.com/w/file/fetch/144425295/blockman_go_mod_apk_unlimited_everything_download_latest_version.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82c0c27f-fc77-46db-a1b4-623e51ec969c/sears_radial_arm_saw_prices.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fde1453-84c1-496c-a880-7c8004c8366e/79269545036.pdfIn PDF document text
    • http://zepadatoju.pbworks.com/f/thai_jashe_movie_download_link.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/725e6887-dccb-4385-9200-09c0a50762aa/what_led_to_the_european_exploration.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ff99056-1502-4af4-9cc4-36eb627a2db3/pogukowuwuwuzubinugev.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a323d110-fcd9-4dc8-b718-87bc38b42f9f/kunezopux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df190162-7dc1-48da-a02f-48bb53924ce4/64552299836.pdfIn PDF document text
    • http://garigor.pbworks.com/f/grams_to_kg_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff52f5f1-ed2a-48e0-af61-0991ff6eed4d/33901381693.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_off00011a00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A00 4972 bytes
SHA-256: 6bfdec8dd0dc798a985f0eb3545779766e245322166881771b9beb7cd91a59a1
font_01_sfnt_off00012aff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AFF 11688 bytes
SHA-256: 4d1eecb4f18fbbf87f289290b2ff2447fd643696252f51aa56de2810239e1437