Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ff85f6038fce01c…

MALICIOUS

PDF

74.5 KB Created: 2021-04-28 06:49:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 7ccbd817f743ea0e99b67112d8283fd5 SHA-1: 294dbb5e60e1faf046a7458b0be7440dbfc68b6c SHA-256: 3ff85f6038fce01cf7d9d87ad698d3447278ae7dee2aa2461e8351993263be32
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm used for phishing or malware distribution. The document body, though heavily obfuscated, appears to contain product-related keywords, likely serving as a lure to encourage clicks on the embedded malicious URLs.

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://kuzutuzo.ru/strik?utm_term=graco+nautilus+3+in+1+car+seat PDF link annotation
    • https://junobinedutuki.weebly.com/uploads/1/3/2/7/132712306/pazodu_vopigatuvesigug_zifevadirewa.pdfIn PDF document text
    • http://maxist.ru/the_battle_of_the_labyrinth_graphic_novelb98r9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385207/normal_5fde845c383e6.pdfIn PDF document text
    • http://phrensy.co/365565281035ayhk.pdfIn PDF document text
    • https://puxolulif.weebly.com/uploads/1/3/4/3/134356270/talovetekim.pdfIn PDF document text
    • https://cdn.sqhk.co/gituridewo/qHKefib/babavorefofowopat.pdfIn PDF document text
    • http://mrshadow.net/what_type_of_battery_does_roomba_usetw1e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369903/normal_5fdbd06de1b26.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459035/normal_6031e77f31dbf.pdfIn PDF document text
    • https://sanituwinera.weebly.com/uploads/1/3/1/3/131379206/ee901adf.pdfIn PDF document text
    • https://cdn.sqhk.co/jegetito/8iihiuF/sheffield_uni_extenuating_circumstances_form.pdfIn PDF document text
    • https://cdn.sqhk.co/mewoveri/gekkJjj/html_code_music_player_for_website.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379374/normal_6003dac7d7a2a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426697/normal_604bbf2501ff0.pdfIn PDF document text
    • https://zewalomoweso.weebly.com/uploads/1/3/4/5/134588134/1029307.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2e6726a7-2e78-456a-9fa1-8bc85c3b20a6.filesusr.com/ugd/76e31d_f8d0baaf18d748f69976e3f5a8eec9bc.pdf?index=trueIn PDF document text
    • https://3df06c22-1e8a-4082-8cc2-a0fdc0609706.filesusr.com/ugd/d86e81_5b82725d9adb458f8763211e760c3436.pdf?index=trueIn PDF document text
    • https://8271b8e8-1520-4b18-8785-2fafc8cd33e6.filesusr.com/ugd/efc97f_709383518ed84b0aaae50e06d7286e15.pdf?index=trueIn PDF document text
    • https://543e2b4d-9699-46d2-9656-875e860b8e63.filesusr.com/ugd/fb32d0_97d8d8fd588b4a0ca8452b830e2bff80.pdf?index=trueIn PDF document text
    • https://6323cc82-cf72-43ae-bc7a-f8d691a1d37e.filesusr.com/ugd/4f3578_43c1b77859204325aaae05f6fba6c165.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lakujusitejojet/gasarozuxuludoxedizu.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_off0000e65d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE65D 5040 bytes
SHA-256: d35182a981bca71c23ecafd647d0198b7138db5ea1a3f4d3816a183bf32b6fe5
font_01_sfnt_off0000f792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF792 10904 bytes
SHA-256: d9fd523a277c4aa0df942f54efcc57a7ea1ff25c7b05fb00f1b3cd10273d3926