Malicious PDF — malware analysis report

Static analysis result for SHA-256 e81fa37fcb4d8466…

MALICIOUS

PDF

76.1 KB Created: 2021-05-29 15:42:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: c3db11c2601751a92e23f43fffbb9ffb SHA-1: b5c6ee78afd196cd556a23b3897d3c45adc7620c SHA-256: e81fa37fcb4d84666e1ce709f051d18680ac9169b1d4b8d3a41ba4aa5169f6c2
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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 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://ponafet.ru/strik?utm_term=madden+21+coin+generator+no+human+verification+ps4 PDF link annotation
    • https://vukisopir.weebly.com/uploads/1/3/0/7/130776420/6003527.pdfIn PDF document text
    • https://zujomesesewega.weebly.com/uploads/1/3/4/9/134902804/muruzuvox_zelikibanibe.pdfIn PDF document text
    • https://tujobofawoti.weebly.com/uploads/1/3/2/6/132695409/puzapexu.pdfIn PDF document text
    • https://wexapifunoru.weebly.com/uploads/1/3/4/7/134715363/tawuj_sozuwilebube_ziloxogabi_fusosoj.pdfIn PDF document text
    • https://devatokur.weebly.com/uploads/1/3/2/6/132683056/1fe65739ef767.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383579/normal_604d33e7d4ea8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423166/normal_600d983830e81.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392872/normal_5fdc249a83d2d.pdfIn PDF document text
    • https://xododasewa.weebly.com/uploads/1/3/4/6/134600374/a49d756.pdfIn PDF document text
    • https://menerixejujup.weebly.com/uploads/1/3/4/6/134605313/76188d8df71328e.pdfIn PDF document text
    • https://famojiwogupoj.weebly.com/uploads/1/3/2/3/132303340/kexip.pdfIn PDF document text
    • https://fixugosotodig.weebly.com/uploads/1/3/7/5/137518485/gepetiledajave.pdfIn PDF document text
    • https://bofuvuwowu.weebly.com/uploads/1/3/1/8/131856225/kebufezipapug.pdfIn PDF document text
    • https://rogakaroguw.weebly.com/uploads/1/3/4/5/134517982/gujigajatozi-rixanur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476596/normal_5fe82887410ba.pdfIn PDF document text
    • https://vifoxofanope.weebly.com/uploads/1/3/4/6/134670603/6004838.pdfIn PDF document text
    • https://mudodawi.weebly.com/uploads/1/3/4/6/134653299/dupojosojopirim_setanizi_devute.pdfIn PDF document text
    • https://kepudeveru.weebly.com/uploads/1/3/4/6/134698703/2c1234230.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/329b9bb3-1155-456d-81ca-f6fdedbdf7ee/software_testing_life_cycle_phases.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af116e3a-3994-4c1e-9eab-224cfecb4a8e/dell_precision_m4600_datasheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39492db1-aeb7-414a-99ee-877f4c14182a/how_to_write_slam_poetry.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cfadb03-7a8a-45ea-a201-18a39b1e559e/battletech_technical_readout_clan_invasion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/121c21d1-91be-44f3-a14e-b5826f99e02f/lets_explore_diabetes_with_owls_summary.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_off0000e7b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B9 5876 bytes
SHA-256: bd33e9a85c75106027f68661c3c974692ff57eed7b877a9adb70e63588ed8b4a
font_01_sfnt_off0000fbb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB4 12076 bytes
SHA-256: f6f5415c5730d5a08dfc8b197c118a59fab1caa538e011adeff362130f931a8c