Malicious PDF — malware analysis report

Static analysis result for SHA-256 863367bd4bbffb9e…

MALICIOUS

PDF

73.0 KB Created: 2021-06-06 01:32:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 3f4e15a1aeab3c23fd2f090fd1ddcd39 SHA-1: 47d20b17020e82c45c5883ef428a9398b435b951 SHA-256: 863367bd4bbffb9ebd3539ea57b3373b7172f7c8608d3ea7122228b99e03fcc9
126 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with a primary focus on `https://philabc.ru/pbw?utm_term=t+ball+baseball+bat+size+chart`. Heuristics indicate this is a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. The ML classifier also strongly flagged this PDF as malicious. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to a malicious site, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://philabc.ru/pbw?utm_term=t+ball+baseball+bat+size+chart PDF link annotation
    • https://dexanobibe.weebly.com/uploads/1/3/5/2/135299911/ad5a0f34b338d4.pdfIn PDF document text
    • https://sekiwamabo.weebly.com/uploads/1/3/4/7/134729119/6574942.pdfIn PDF document text
    • https://nimujebiparifil.weebly.com/uploads/1/3/4/7/134730121/xuturaxaf_vafopi_fopanizakijudil_visareruxozo.pdfIn PDF document text
    • https://duzopotubesafes.weebly.com/uploads/1/3/4/8/134890215/cab3be768.pdfIn PDF document text
    • https://pusikeruwupij.weebly.com/uploads/1/3/4/5/134518778/8592f.pdfIn PDF document text
    • https://vudegerolo.weebly.com/uploads/1/3/1/4/131452783/9cb0fe.pdfIn PDF document text
    • https://fajubelikuvevut.weebly.com/uploads/1/3/4/8/134851309/perimawoxomimos.pdfIn PDF document text
    • https://lezunodukulo.weebly.com/uploads/1/3/4/3/134341823/bekenutakene.pdfIn PDF document text
    • https://zudilutunab.weebly.com/uploads/1/3/4/5/134588168/nusomom_saruvize.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tufukamapaf.pbworks.com/w/file/fetch/144687126/14782055292.pdfIn PDF document text
    • http://mujefapufefi.pbworks.com/f/81614897812.pdfIn PDF document text
    • http://mifudatu.pbworks.com/w/file/fetch/144688878/libros_harry_potter_tapa_dura_salamandra.pdfIn PDF document text
    • http://mulasamesi.pbworks.com/f/nonstop_game_cyber_raid_tier_list.pdfIn PDF document text
    • http://vefubop.pbworks.com/f/how_to_use_lm35_temperature_sensor.pdfIn PDF document text
    • http://zuvuzut.pbworks.com/f/78838569165.pdfIn PDF document text
    • http://wemilamozede.pbworks.com/f/literary_devices_list_and_definitions_and_examples.pdfIn PDF document text
    • http://jivevisubido.pbworks.com/f/26204189580.pdfIn PDF document text
    • http://paderukut.pbworks.com/f/mediacom_cable_channel_guide_dubuque_iowa.pdfIn PDF document text
    • http://gediripu.pbworks.com/w/file/fetch/144558162/jotibapoxewepu.pdfIn PDF document text
    • http://wufamazajo.pbworks.com/w/file/fetch/144564738/geporiwebevaxafuperifi.pdfIn PDF document text
    • http://favixose.pbworks.com/f/kexivawebopipogilep.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_off0000e225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE225 5028 bytes
SHA-256: e4d238e9fbb05e613de80f92191c8c4152502727103a73188cf69dec3fff24f8
font_01_sfnt_off0000f33a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33A 10368 bytes
SHA-256: c4904ff8ef48beb43cd582c3cbb8a6f3bb686cc7990353bb622a5e9a37b2649e

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