Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cc7f8377f4617be…

MALICIOUS

PDF

73.7 KB Created: 2021-04-07 21:21:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 2662020dfc40895d2fc09d603990b1d4 SHA-1: 63c74ebd446c7b04d0c4643e3badb26d8e7e5308 SHA-256: 3cc7f8377f4617bec811738d70909c658fd91eb61eef175224c7c006dceae00e
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The presence of a ML classifier flagging the PDF as malicious and ClamAV detection further supports its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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 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=harry+potter+all+questions+house+quiz PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450156/normal_600eda3e9c88f.pdfIn PDF document text
    • http://cocobeautybar.ca/house_flipping_business_plan_australiaz49y5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420930/normal_6049ae2530d56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481155/normal_602089997b2f3.pdfIn PDF document text
    • http://feedbacrnz.space/kirby_g5_repair_manualxpagq.pdfIn PDF document text
    • http://hocostyle.ru/65123731839b5xxj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382966/normal_6025456a43b3b.pdfIn PDF document text
    • http://steblin.pro/270357506928jndh.pdfIn PDF document text
    • http://baffer-shop.space/fupuriwiapfub.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wadokeg.epizy.com/89448906708.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74dc6aba-e21f-459f-8ac1-ffb5119479a2/xowanetigofisarepufovi.pdfIn PDF document text
    • http://daporev.epizy.com/37242173761.pdfIn PDF document text
    • https://b3159766-6c8b-4733-a97d-e59ef6783693.filesusr.com/ugd/21851e_138a0bb449a14bf6aec2a0f68c95d304.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/40bc37d1-eb45-45d7-86d7-e88273a466d8/cub_scout_wolf_requirements_2019.pdfIn PDF document text
    • https://3d3b31fc-6152-41c7-b1d4-a4af3afcce63.filesusr.com/ugd/3f8d85_1918eb3a3f334d38b89d5dfca8e4d445.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d12aa53f-5559-47ab-b125-c9ee14a81ed8/koguzewakozadapilepat.pdfIn PDF document text
    • https://f2d828cf-06d9-46ea-85af-d88b0bc20d44.filesusr.com/ugd/501a20_5971bee5fb37472c87f7b78e5ff50656.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/22380f9e-731f-4150-b37a-f1dc354d680f/2007_chevy_silverado_classic_service_manual.pdfIn PDF document text
    • https://184d393c-d2ff-49e5-bbcb-48626b1dbf88.filesusr.com/ugd/49be48_473540fc340a42a38fee37cb556b70a0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc40db09-6385-4691-acbd-41f464378a46/tai_chi_24_form_breathing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07c003a5-7c22-44d0-a144-958c4b64d66c/criminal_law_definition_simple.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/416a5c1c-53dc-4d41-aea6-4cf6f455a563/how_to_make_a_record_storage_cabinet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4ff49c1-6c31-462d-8c8f-f7e0e9b988c6/twilight_breaking_dawn_part_1_cast_members.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_off0000e1b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B1 5144 bytes
SHA-256: 166b25bb6af4e658c99d759f05ce14b06043274f6ceda0f4c06230b9d11f9e57
font_01_sfnt_off0000f33e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33E 11316 bytes
SHA-256: 33fc1334173fe2dd7711e1702c57c278b85af74fb4f6967b9dc9b7e76354690e