Malicious PDF — malware analysis report

Static analysis result for SHA-256 b44b723a21d5c799…

MALICIOUS

PDF

84.1 KB Created: 2021-05-11 18:03:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 380a3a9f8ff25d4455e7dc1e9a7b7727 SHA-1: 904d2e764a6beb0e6eaf864ba3f03ffa432d01a5 SHA-256: b44b723a21d5c7991210293a49b536795530b86c81abde1814e5d26910c1bfc7
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and numerous external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dugedepap.ru/strik?utm_term=what+is+the+newest+rainbow+vacuum PDF link annotation
    • http://forkidsshop.online/do_they_find_percy_in_the_son_of_neptuneaiwmm.pdfIn PDF document text
    • https://cdn.sqhk.co/lewuravasu/hjFgigi/suxomupelomobugikejaji.pdfIn PDF document text
    • https://nubazodakop.weebly.com/uploads/1/3/4/8/134850303/lufakekejiwejokuwufa.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/hhjdhid/43068504625.pdfIn PDF document text
    • https://cdn.sqhk.co/reriwoduriju/z9vhiSE/cowboy_beans_recipe_with_ranch_style_beans.pdfIn PDF document text
    • https://tezifotunojoke.weebly.com/uploads/1/3/0/7/130776805/duzidolafezowipijeg.pdfIn PDF document text
    • https://famixupeb.weebly.com/uploads/1/3/4/7/134733803/suwobevosakowoweno.pdfIn PDF document text
    • http://goods-amzon.com/bimusa5fgbz.pdfIn PDF document text
    • https://lubigovoxudi.weebly.com/uploads/1/3/4/1/134109264/xekosu.pdfIn PDF document text
    • https://cdn.sqhk.co/zuronenom/idvzTjm/28531773571.pdfIn PDF document text
    • https://kezidixujaroko.weebly.com/uploads/1/3/4/0/134040737/zokazexu.pdfIn PDF document text
    • https://guxofoxevi.weebly.com/uploads/1/3/4/7/134737998/7938577.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/jathiji/tigesavezodavawazezodoju.pdfIn PDF document text
    • https://zudobusida.weebly.com/uploads/1/3/5/3/135330479/tikoluneloviwigul.pdfIn PDF document text
    • https://tibiwoxot.weebly.com/uploads/1/3/4/8/134881218/ff474b8.pdfIn PDF document text
    • http://prod-fruit.space/pudafukegomark9ef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gurafoga/what_ink_cartridge_for_epson_wf-2630.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/12740364935.pdfIn PDF document text
    • https://s3.amazonaws.com/boduxatavepe/honda_fit_2007_tire_size.pdfIn PDF document text
    • http://nuduvemomuto.epizy.com/linear_programming_and_network_flows_2nd_edition_download.pdfIn PDF document text
    • http://bezixezejagu.rf.gd/iit_jam_mathematics_syllabus_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/vavejijitatofu/24012466827.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_off0000ff14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF14 5312 bytes
SHA-256: dc0b5908b9542af876b5b0a7747d5db343f50b66eb158b83792c730b699233c5
font_01_sfnt_off00011115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11115 16212 bytes
SHA-256: d93d5fdd199f3f9cf933d27d537bbf214e6168b604627e3f994f5aaa36c4ca7e