Malicious PDF — malware analysis report

Static analysis result for SHA-256 a33a816ca6fb85d6…

MALICIOUS

PDF

70.9 KB Created: 2021-06-08 10:43:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: f8328b8b9c76c89af7665fdd121bc47d SHA-1: 3f45af156f14fdbe21960c2def2dfb2caf3c4f05 SHA-256: a33a816ca6fb85d6eacc3e3fc7618d7a9d3d6dec34de9b069e3a51e39c80daed
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting services, characteristic of a link farm designed to generate traffic or distribute malware. The document body, though heavily obfuscated, suggests a lure related to 'linear models with r faraway solutions', indicating a potential phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://medvor.ru/pbw?utm_term=linear+models+with+r+faraway+solutions PDF link annotation
    • https://molozotupinomel.weebly.com/uploads/1/3/4/3/134340336/4389822.pdfIn PDF document text
    • https://jibametugo.weebly.com/uploads/1/3/4/4/134486067/xozelapozukodakos.pdfIn PDF document text
    • https://bemikazuriku.weebly.com/uploads/1/3/4/6/134648669/butalokiz_tosolinuru_kugemal.pdfIn PDF document text
    • https://zafapajesat.weebly.com/uploads/1/3/0/7/130740498/mozuda.pdfIn PDF document text
    • https://jivexine.weebly.com/uploads/1/3/1/3/131380908/aa81a50795eb8.pdfIn PDF document text
    • https://jududive.weebly.com/uploads/1/3/4/7/134766718/648210.pdfIn PDF document text
    • https://wixivowid.weebly.com/uploads/1/3/4/6/134689466/9021518.pdfIn PDF document text
    • https://gulatavinijigu.weebly.com/uploads/1/3/4/5/134507109/0a93cf9b27eaf67.pdfIn PDF document text
    • https://wigubidukes.weebly.com/uploads/1/3/1/6/131606651/8801210.pdfIn PDF document text
    • https://motisodufar.weebly.com/uploads/1/3/5/4/135400919/8b77b4.pdfIn PDF document text
    • https://sixupotivene.weebly.com/uploads/1/3/4/3/134305687/db22d4e53.pdfIn PDF document text
    • https://namulore.weebly.com/uploads/1/3/4/0/134017746/2f60d5.pdfIn PDF document text
    • https://tefexetu.weebly.com/uploads/1/3/4/5/134593975/fugezemezobeno-pilogazefeki-gezevobilud-xukufig.pdfIn PDF document text
    • https://rilitovewub.weebly.com/uploads/1/3/4/0/134095842/wivem.pdfIn PDF document text
    • https://gunesuzupe.weebly.com/uploads/1/3/4/6/134679160/c42603.pdfIn PDF document text
    • https://vekoliro.weebly.com/uploads/1/3/4/4/134482952/zogavefiworelax_vukajomorexik.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tebejeloxid.pbworks.com/f/20505264447.pdfIn PDF document text
    • http://kekirow.pbworks.com/w/file/fetch/144412473/bir_kawit_phone_number.pdfIn PDF document text
    • http://wixugigir.pbworks.com/f/audi_a3_2006_workshop_manual_free_download.pdfIn PDF document text
    • http://fuzobonesujo.pbworks.com/w/file/fetch/144564345/ps4_emulator_games_for_pc_free_download.pdfIn PDF document text
    • http://jitijaloj.pbworks.com/f/free_prenuptial_agreement_template_nz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ceb7e2a-f14a-499f-a591-f1b14040468f/dumegasupevupuxinegu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03350ecb-f43f-466d-ab28-6dc882645623/timex_t2312_alarm_clock_radio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19d71b6d-b3a9-4b31-a906-5326ea8eed6c/is_ps4_vr_compatible_with_roblox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f35168e9-906d-47aa-8a5d-fe4dce5879dc/manual_de_carreo_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67fdc9fb-6144-4012-98dc-f77d2e6989af/dusajekasobak.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_off0000d95b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD95B 5284 bytes
SHA-256: 88ecaf09524ed33650e29cfd797a58d479b76364ef45efb5782154000e9d48a8
font_01_sfnt_off0000eb3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3F 10092 bytes
SHA-256: bd3d7a22315c80c6f900e55b31e68e4ab376e0f4895564391f5c5b75727b40b8

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