Malicious PDF — malware analysis report

Static analysis result for SHA-256 aed421dba155cf4b…

MALICIOUS

PDF

74.5 KB Created: 2021-04-02 03:48:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ae92873024abb05ec8679822c8ebb951 SHA-1: d0521b5f2d6f14dc3e581cc6c3dba7d87b1bba35 SHA-256: aed421dba155cf4bc9f5a106a04fc79cc4c91107f1cbbda6839aede24a8304f2
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, many of which point to PDF files, suggesting a link farm or SEO poisoning tactic. The embedded URLs are likely used to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/123?utm_term=lamborghini+song++mp4+full+hd
    • http://xakavewazoxejef.22web.org/kung_fu_panda_2_full_movie_in_hindi_dubbed_youtube.pdf
    • http://bopolubolef.mywebcommunity.org/25332245128.pdf
    • http://gejesixave.scienceontheweb.net/lev_grossman_the_magicians_book_order.pdf
    • https://nedijevir.weebly.com/uploads/1/3/1/4/131406348/32f986.pdf
    • https://cdn-cms.f-static.net/uploads/4424683/normal_60526d04d6b3d.pdf
    • https://cdn-cms.f-static.net/uploads/4445868/normal_603fb69e33fb2.pdf
    • https://static.s123-cdn-static.com/uploads/4420222/normal_5fc6019f5776c.pdf
    • https://fazapezipomen.weebly.com/uploads/1/3/1/4/131453522/4379047e.pdf
    • https://cdn-cms.f-static.net/uploads/4457838/normal_60504941b1f48.pdf
    • https://dewisepiremutu.weebly.com/uploads/1/3/4/3/134318599/fatopupidutul_xelirazizomisit.pdf
    • https://cdn-cms.f-static.net/uploads/4473041/normal_604dbb0f87579.pdf
    • https://duzareledibasa.weebly.com/uploads/1/3/4/8/134890493/wedebenizedobinij.pdf
    • https://vadutebo.weebly.com/uploads/1/3/4/8/134889136/a2daecd7e9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://804b95bc-9ca4-448d-a094-5a8e1ff69a26.filesusr.com/ugd/99d1da_7675a9db5434403790a6d9f45ec73f08.pdf?index=true
    • http://jutemimiseg.epizy.com/christmas_songs_chords.pdf
    • https://d89d6b52-6e76-4e18-bccb-bd7428cfddad.filesusr.com/ugd/02beb7_d164b34f2e7047b78dbe42600709e113.pdf?index=true
    • https://49432a94-54bc-4d13-9d12-ea41d731e1b8.filesusr.com/ugd/a7c689_b47fcd0a9848464f95dea101bbe9c82c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d3e06d1e-2f83-411a-a406-c74f3009097d/93101216607.pdf
    • https://56a7be67-7dca-40da-a973-69ad719fb73b.filesusr.com/ugd/fedf23_02d7a681828343e4819d4fcb1e873506.pdf?index=true
    • https://uploads.strikinglycdn.com/files/82f9415a-ea76-4dc5-8938-309ceb50ad99/how_to_tighten_delta_monitor_shower_handle.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5b7.bin
8f80d9d4291a130eed645a626006895420ec62de8ee518c002551e90ecda7a77
pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B7 5308 bytes
font_01_sfnt_off0000e78b.bin
0c9b90e85a59eae319938de8457f253c0e162ea0825da4015135489922ce4dc4
pdf-font-stream PDF embedded font (sfnt) at offset 0xE78B 10900 bytes
font_02_sfnt_off00010ce8.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE8 4324 bytes