Malicious PDF — malware analysis report

Static analysis result for SHA-256 9113ab45c493257d…

MALICIOUS

PDF

79.2 KB Created: 2021-06-09 06:50:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 7e8f930d94e75fb29d452f59d096078f SHA-1: 69151a1104758641ff01a677de593d9703bca6c4 SHA-256: 9113ab45c493257d988bcd69a66df662b0154b02aadee19da90c8f094303aaac
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a large number of external links, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. One prominent URL, 'https://krisoc.ru/pbw?utm_term=minecraft+free+apk+download+for+pc', suggests a lure for downloading software. No scripts were extracted, but the structure and embedded links indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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://krisoc.ru/pbw?utm_term=minecraft+free+apk+download+for+pc PDF link annotation
    • https://wigowaziralo.weebly.com/uploads/1/3/4/4/134498628/7b79f00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387412/normal_6053203f09bd7.pdfIn PDF document text
    • https://gubetixe.weebly.com/uploads/1/3/4/3/134314982/381936110506a14.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487191/normal_603c3826ac9e8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388405/normal_605cf7fc000e1.pdfIn PDF document text
    • https://gilitizek.weebly.com/uploads/1/3/4/1/134131368/fitopivikefexuvawor.pdfIn PDF document text
    • https://defupaga.weebly.com/uploads/1/3/2/6/132681490/dd8c5a.pdfIn PDF document text
    • https://zuvoxowiton.weebly.com/uploads/1/3/0/8/130813332/1264703.pdfIn PDF document text
    • https://xovotirepotu.weebly.com/uploads/1/3/1/4/131412955/8590233.pdfIn PDF document text
    • https://sonadenazutimiw.weebly.com/uploads/1/3/4/6/134654654/tajuzejuzovozose.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369313/normal_603612cd66a95.pdfIn PDF document text
    • https://neposuxanu.weebly.com/uploads/1/3/0/7/130740617/zesodivipi.pdfIn PDF document text
    • https://mupililoxer.weebly.com/uploads/1/3/5/3/135302313/65073.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
    • https://uploads.strikinglycdn.com/files/58126660-03db-4808-bc6e-815d7b676bf7/how_to_calculate_enthalpy_change_of_a_reaction_per_mole.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2f07871-7d39-4325-995f-4e27ef8eae2c/64222007820.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47b0285d-5906-4f0b-bff7-d8ba21e12965/tutozumanagosavulaxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/630b3c99-cba0-4077-8efd-aafb32e58f89/tibiked.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7687172a-c05c-48ec-b285-3145e3b20941/6.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a22d2d24-1b76-484b-950f-a9e0024330da/sadlier_vocabulary_workshop_level_d_unit_14_synonyms_and_antonyms_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4904bb1f-1c39-4a97-98e6-214d74df93f6/tekezapedibigenomilo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3aa4087a-6373-40aa-8b94-48153961b398/95597181380.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84ce725f-afe1-467f-9799-e469aa6487ca/ancient_greece_class_assembly_ks2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2900a63-90e4-4c94-8bce-2cdba1fc177e/little_shop_of_horrors_plant_name.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bb21b46-7fd6-4404-a437-20c19b1e31ef/suwomepojedadosijizatum.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e83e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83E 4920 bytes
SHA-256: 5ddfced9f71f3d7e2343e8b3969b6c001ef59228f322d7d777151a27a60c5745
font_01_sfnt_off0000f916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF916 12584 bytes
SHA-256: aab65905bf98826b68fc0a2df3d332589e8d28806662e70e1e50a04b5f978dab
font_02_sfnt_off00012110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12110 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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