Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b2b811e13d51e86…

MALICIOUS

PDF

72.4 KB Created: 2021-04-06 09:07:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9d3a512b880fe92ebb09545ab828796d SHA-1: e953f3a6fa0077963dc54aa7c256e83f8b7f1fd0 SHA-256: 3b2b811e13d51e86fe8b3f882bb819e129b4c65c49e335f8a6114c70f94f3bd5
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

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://golowaki.ru/strik?utm_term=ge+profile+microwave+manual+pdf PDF link annotation
    • http://copyright-securityx.com/tipos_de_comunicacion_oral_panel6ve0y.pdfIn PDF document text
    • http://istra-backwater.ru/99889995394v5lpb.pdfIn PDF document text
    • https://jabenawonidibe.weebly.com/uploads/1/3/5/3/135385032/6324458.pdfIn PDF document text
    • http://filmera.ru/craftsman_garage_door_opener_green_learn_buttonn7cei.pdfIn PDF document text
    • http://afracheat2.xyz/venikafi3hjb5.pdfIn PDF document text
    • http://vittorguxx.site/nudubidesuxodufadizimu2nuh.pdfIn PDF document text
    • http://wisecredit.info/tozevabebavifogopofurileg9rwxh.pdfIn PDF document text
    • http://hookup681.site/wd_my_cloud_ex4_custom_firmwaremqnsf.pdfIn PDF document text
    • https://jitoxazenop.weebly.com/uploads/1/3/4/5/134588357/c5362d7b9b2.pdfIn PDF document text
    • https://nagiliju.weebly.com/uploads/1/3/1/4/131412426/02be19df081b.pdfIn PDF document text
    • https://wobufijurix.weebly.com/uploads/1/3/1/6/131607063/8313527.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/zatazewoz/gamafajijamol.pdfIn PDF document text
    • https://s3.amazonaws.com/zeworibuzoza/what_is_prime_number_means.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59e2a509-36ad-419a-97d2-d56db133c8c6/2016_harley_touring_service_manual.pdfIn PDF document text
    • https://37bcb4aa-7747-4ff6-a352-0e22bf983c21.filesusr.com/ugd/4393d3_d7fd32251f3d4401a78d0979918457f4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fff7031-9140-4e44-abd5-d6013f38f4b0/mupeziv.pdfIn PDF document text
    • https://a3de454e-1598-42bb-a259-4eb69c42f179.filesusr.com/ugd/fb5067_a01ff85b32314d71a6771d6bced2929e.pdf?index=trueIn PDF document text
    • https://fa53e508-d88d-41cb-897c-7a5b6f1bfcc3.filesusr.com/ugd/361045_60724d09214748a0bb30f37474736b74.pdf?index=trueIn PDF document text
    • https://e1cf253b-b3af-4135-a675-1c3c021177f9.filesusr.com/ugd/111c46_5200a041c1af4e318a62b421a36b5f27.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pasawexawinogad/parenolixotifagemo.pdfIn PDF document text
    • https://b8436764-02b3-4471-8711-1e8fed235cf0.filesusr.com/ugd/3b3fbb_d75e2368de3d45f7a4633c81e360a9b9.pdf?index=trueIn 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_off0000ddb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB7 5308 bytes
SHA-256: 7f187c9040bd080d0fde838bd0d456e395930dd2c5d5edb5acabb27c2a9167fa
font_01_sfnt_off0000efc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC9 10760 bytes
SHA-256: 371ee3e7f333ccf1ad29b1a43961204a5f6c431d22337bddf9ff050c2f585c1b

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