Malicious PDF — malware analysis report

Static analysis result for SHA-256 2eef35e880ac70ef…

MALICIOUS

PDF

105.3 KB Created: 2021-04-25 15:43:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 8ffef4868fefb68e31f2acd6ecacfa2b SHA-1: eab630dff496ea37a16c6af8313ca5a930a96e04 SHA-256: 2eef35e880ac70ef73f38dfdb9a25082082bc621ce1996a46056cdbd4455f617
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable or unknown hosting, suggesting a link farm designed to redirect users. The document body, though heavily garbled, contains references to 'wkhtmltopdf' and a date, indicating it was likely generated programmatically to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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 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://maypoin.ru/strik?utm_term=the+hound+of+the+baskervilles+summary+of+all+chapters PDF link annotation
    • https://mugapasuxow.weebly.com/uploads/1/3/1/4/131437627/aa199139.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481695/normal_5fe359caaf629.pdfIn PDF document text
    • https://lelebozo.weebly.com/uploads/1/3/4/5/134578107/wexodonepix.pdfIn PDF document text
    • http://woziwowariv.sportsontheweb.net/aoac_method_996._11.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368736/normal_600977942b86d.pdfIn PDF document text
    • https://kamedewogivazu.weebly.com/uploads/1/3/4/0/134096977/nosolexak-xuwetovuzoji-povurotekegot.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449783/normal_5ff136d432f4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383801/normal_601a12b228390.pdfIn PDF document text
    • https://lopetumidola.weebly.com/uploads/1/3/3/9/133989387/7614199.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376375/normal_5fe7ff15e9d35.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8ada768-a970-427f-a0bf-0efc0b5f1d30/88993296805.pdfIn PDF document text
    • http://jiwuwusa.epizy.com/mechanism_of_action_of_cardiac_glycosides.pdfIn PDF document text
    • http://kujazidi.epizy.com/android_sdk_version_android_9_not_found.pdfIn PDF document text
    • http://naxefugoxodikow.atwebpages.com/araby_full.pdfIn PDF document text
    • https://s3.amazonaws.com/bifadiwuwileji/101_bus_schedule_santa_rosa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/426dddd2-7f61-4e77-94aa-6dd81e424027/samsung_q7f_display_specifications.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc5b7318-95b3-4eb1-808b-aaf7bb990173/how_to_connect_your_hp_deskjet_2600_to_wifi.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatofubote/50741687838.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c788e724-b8a2-4769-b4df-f62d6f2c66e9/how_to_install_adobe_premiere_elements_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66685be0-3c50-4eaf-bf34-4c2cba3a4a2b/is_it_worth_fixing_a_bosch_dishwasher.pdfIn PDF document text
    • http://luvafavuma.rf.gd/3903933449.pdfIn PDF document text
    • http://rokosarod.rf.gd/libro_apestoso_tio_muffin.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_off00014248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14248 5416 bytes
SHA-256: fdf8128db0a807c2e93f75357d9c42b87406fc842b81af895607d4254ab4215a
font_01_sfnt_off0001553a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1553A 5712 bytes
SHA-256: b54622ab48a22b995fedc3d3fcc7e0f201df37bd2f35b746917ca5b8075f7be7
font_02_sfnt_off00016884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16884 15124 bytes
SHA-256: 7e0cfdfc1325aefd9efb89cca1b01de685da639109b8343f403f438b294c3f3a