Malicious PDF — malware analysis report

Static analysis result for SHA-256 628e3b32d7b01784…

MALICIOUS

PDF

84.7 KB Created: 2021-03-29 12:17:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 06fc7e2a35e0c7352e148d1606332897 SHA-1: 18e088f128ca3550c2e92a8d77f32bfa546273dc SHA-256: 628e3b32d7b01784a5baefa48890dd3fc623f7c9d522da4e5036513179ff4868
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains multiple embedded URLs, with at least one pointing to a disposable hosting service, suggesting a link farm or phishing lure. The document body, though partially corrupted, contains keywords related to scientific classification, which is likely used as a pretext to disguise the malicious links. The presence of external URIs and the link farm heuristic strongly suggest the document's purpose is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://fokemale.ru/award?keyword=clasificacion+de+los+seres+vivos+segun+whittaker+pdf PDF link annotation
    • https://lezuzanufebaj.weebly.com/uploads/1/3/4/8/134873312/xugurus.pdfIn PDF document text
    • http://autokenn.com/ms_project_2010_tutorial_for_beginnersykaxs.pdfIn PDF document text
    • https://cdn.sqhk.co/xadakede/Bmgepjb/92214823636.pdfIn PDF document text
    • http://good-production20.site/danby_countertop_dishwasher_installationi110f.pdfIn PDF document text
    • http://bu-markett.com/periodic_table_worksheet_11ib0f.pdfIn PDF document text
    • https://japafapu.weebly.com/uploads/1/3/1/4/131437770/6740108.pdfIn PDF document text
    • https://muzobaxokeze.weebly.com/uploads/1/3/2/6/132682229/7296310.pdfIn PDF document text
    • http://b0xberry.online/jajebomllwpb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460263/normal_60262302b840e.pdfIn PDF document text
    • http://chambreapp.xyz/mibazopesasavuxofejafivo3hlgr.pdfIn PDF document text
    • https://cdn.sqhk.co/rabuzopat/ajbWUFe/70848317483.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446152/normal_606157950cde3.pdfIn PDF document text
    • http://akillidestekbasvuruformu.online/57461344923di4wd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423442/normal_5fceb0488c51a.pdfIn PDF document text
    • http://centerbluebadge.com/android_games_apps_freef9w3k.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xakapudakadu/2019_s60_inscription_review.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwamoxamo/how_to_reset_a_whirlpool_accubake_oven.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_off0001080e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080E 5540 bytes
SHA-256: 892b5eeef062920a2bc4d45c6594ee8ac3028cc643bbd4854882be351304003f
font_01_sfnt_off00011aee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AEE 12808 bytes
SHA-256: 14284cdb16e0eb12055ef4e90549121ac7b5162da50a1a17ef0a34ceb30856d5

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