Malicious PDF — malware analysis report

Static analysis result for SHA-256 a12f3760a1f69b22…

MALICIOUS

PDF

79.6 KB Created: 2021-03-11 00:29:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ad054d2a8e467d91ce710f4c12e7a324 SHA-1: 16c2da9b34f42d3ef047355511fe4212b0a3c8d2 SHA-256: a12f3760a1f69b22de30ce3e83adb2a91e5b407a47aaa953472e5b5f43fcfdb7
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 0.9998

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://midufefew.ru/wix?keyword=total+war+3+kingdoms+guide PDF link annotation
    • http://gojoges.iblogger.org/13852288787.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478687/normal_6013805247853.pdfIn PDF document text
    • http://fumerox.iblogger.org/naruto_online_mobile_tencent.pdfIn PDF document text
    • https://cdn.sqhk.co/delinilipo/jaifPwn/zevuseregoberoxisi.pdfIn PDF document text
    • https://cdn.sqhk.co/zunezafi/cMjed1k/ranker_plus_app.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495390/normal_5fe853178e40e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wimixuv.epizy.com/agneepath_1990_songs.pdfIn PDF document text
    • http://talaxapu.epizy.com/didetapode.pdfIn PDF document text
    • https://746420f6-3007-491b-ba72-fd43be5094e5.filesusr.com/ugd/277b62_6983608448a143c3b23f298f1fff7590.pdf?index=trueIn PDF document text
    • https://37523d11-79cf-4eb3-ada4-f05de57c71ee.filesusr.com/ugd/275374_1cf3619186c449e19de0805f9ae25056.pdf?index=trueIn PDF document text
    • https://8bd0dbf5-62e0-4684-a95a-1d9666dfa34a.filesusr.com/ugd/e71694_0094460fdd44457f8a4b74ec03978797.pdf?index=trueIn PDF document text
    • https://044e8d80-c429-4a1f-820d-9b443c65b389.filesusr.com/ugd/53c654_d90679cc474c42b6b44e07fe28f9ecbe.pdf?index=trueIn PDF document text
    • https://dda5c79a-a75d-44d9-a006-48dec3bfe172.filesusr.com/ugd/115d6e_a86181259aac435fac014198eb751be9.pdf?index=trueIn PDF document text
    • https://e26976e3-f089-44cc-a2a6-54bcc6cae308.filesusr.com/ugd/0df15e_5bc95e82b2854d96bd0b12a32998986e.pdf?index=trueIn PDF document text
    • https://989244f3-426d-4557-b4f1-0018dac9047c.filesusr.com/ugd/57c819_3fcb2455c92049fda3db1617f297aa81.pdf?index=trueIn PDF document text
    • https://18aefb47-0221-41c7-ace0-4f78eb33e730.filesusr.com/ugd/bca722_bfd3beb5dd3644a8ad4050794b6a9cf7.pdf?index=trueIn PDF document text
    • https://b9eb3541-094c-4606-b101-17c2291fd6e1.filesusr.com/ugd/a18601_fc2c881d61734a03a98390d01844977b.pdf?index=trueIn PDF document text
    • https://3d15200b-ba10-45fc-bed8-3495b7b33e5b.filesusr.com/ugd/2e16aa_5c3b760f4aac4a32a817ce94ea46c754.pdf?index=trueIn PDF document text
    • https://cf2e1f24-e5f1-4289-9567-3affce9c164e.filesusr.com/ugd/a4ea6c_a6f8ac8390f54f78884212a289753ec6.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_off0000fb96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB96 5416 bytes
SHA-256: e06b33ea349177e11d4d41225a6275d8ce13cf365149c45f3f131798a60e71ba
font_01_sfnt_off00010dfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DFA 10476 bytes
SHA-256: 4dda9386efafe0f5f5ef4aebff8253f32fd9691764030aafd6d3672b4565002c

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