Malicious PDF — malware analysis report

Static analysis result for SHA-256 93b7f30af2bc1326…

MALICIOUS

PDF

72.0 KB Created: 2021-06-10 01:38:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: e34a2d27c70def029cba143d2d3f218c SHA-1: 50e1826058022a77513cd3b82d204a65fbfa65e7 SHA-256: 93b7f30af2bc1326c279a958056010abe123025fae6fb2c6e9fe6e0ad2948e52
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or SEO spam operation. The document body, though heavily obfuscated, contains references to a 'timesheet calculator' and authoring application details, which are likely lures to encourage users to click the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nomylo.ru/pbw?utm_term=miracle+salad+timesheet+calculator PDF link annotation
    • https://takewozijofu.weebly.com/uploads/1/3/2/6/132682119/8704709.pdfIn PDF document text
    • https://kawepuwaseleza.weebly.com/uploads/1/3/4/8/134849925/romakejagefepez.pdfIn PDF document text
    • https://pevaluxuduta.weebly.com/uploads/1/3/4/5/134502983/zesuzumorukazisoli.pdfIn PDF document text
    • https://wesamirovajep.weebly.com/uploads/1/3/5/3/135383051/5bd424.pdfIn PDF document text
    • https://dafalozurevibi.weebly.com/uploads/1/3/4/3/134308304/fonoj-zovanagire-fenoregoditise-nebefabo.pdfIn PDF document text
    • https://wazijewafaset.weebly.com/uploads/1/3/4/4/134437152/5055671.pdfIn PDF document text
    • https://kurakozizuvev.weebly.com/uploads/1/3/2/6/132681999/274ca2c.pdfIn PDF document text
    • https://vewusijonaw.weebly.com/uploads/1/3/4/4/134489037/06101.pdfIn PDF document text
    • https://sekugiwa.weebly.com/uploads/1/3/0/7/130739582/63e7d7.pdfIn PDF document text
    • https://kobuvedubi.weebly.com/uploads/1/3/4/0/134017802/4953189.pdfIn PDF document text
    • https://zibabesisem.weebly.com/uploads/1/3/4/6/134670176/rikexililuxinasofem.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
    • http://rizukokodi.pbworks.com/f/39430970096.pdfIn PDF document text
    • http://wikitaxif.pbworks.com/f/honda_gx390_generator_service_manual.pdfIn PDF document text
    • http://todenulaw.pbworks.com/f/def_of_a_narcissist.pdfIn PDF document text
    • http://runaliguredu.pbworks.com/w/file/fetch/144873684/beethoven_-_fr_elise_klutch_dubstep_trap_remix_download.pdfIn PDF document text
    • http://kokoxudalux.pbworks.com/f/399103363.pdfIn PDF document text
    • http://tovovojufa.pbworks.com/f/soul_knight_weapon_guide.pdfIn PDF document text
    • http://vazexetuv.pbworks.com/f/what_do_animals_in_dreams_mean.pdfIn PDF document text
    • http://fotikeralo.pbworks.com/f/96627985039.pdfIn PDF document text
    • http://kimotamiju.pbworks.com/w/file/fetch/144505230/99770979697.pdfIn PDF document text
    • http://jejosuxiz.pbworks.com/w/file/fetch/144503079/wojefe.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_off0000d162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD162 4960 bytes
SHA-256: 58f0c36668395d47a1272164b938b9240f18653f56173d08c6ab5746b57fe8b1
font_01_sfnt_off0000e239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE239 10056 bytes
SHA-256: 7d289c5c00142e97de2a3f57c67fe0d8ac7bae974449fe18d2d9dd40b9342134
font_02_sfnt_off0001049f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1049F 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e