Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e68a544c8354c84…

MALICIOUS

PDF

77.5 KB Created: 2021-03-12 21:48:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b375e5eac419a82955871789130e9e00 SHA-1: 8eb9bc8710fa22d69a2e9aab4084034e14a463bd SHA-256: 1e68a544c8354c84dca4c9a671f2e45bd56adede82b5702e6c6712ebcb232f96
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, indicative of a link farm designed to host malicious content. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this malicious intent. The presence of a 'SE_DOWNLOAD_BUTTON' heuristic further supports a lure-based attack pattern. Although no scripts were explicitly extracted, the overall structure and link farm behavior point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jacksth.ru/award?keyword=interior+design+books+pdf+free+download PDF link annotation
    • http://hookup153.online/606378946343al21.pdfIn PDF document text
    • http://myimperfectmomlife.com/kofaxofemejilsumck.pdfIn PDF document text
    • http://mscredit.info/far_117_reserve_table_bwjf9v.pdfIn PDF document text
    • https://fojowixejomad.weebly.com/uploads/1/3/2/6/132681658/f30e3586d46.pdfIn PDF document text
    • https://wafulerafi.weebly.com/uploads/1/3/4/5/134503758/fujivudiguwavikor.pdfIn PDF document text
    • https://bakozejujibabe.weebly.com/uploads/1/3/4/3/134373724/f7ae40f.pdfIn PDF document text
    • http://nijikelax.22web.org/66119321446.pdfIn PDF document text
    • http://podarokinsta365.site/1551257904262ttd.pdfIn PDF document text
    • http://musc-media.xyz/47140933883dvlgu.pdfIn PDF document text
    • https://betirowi.weebly.com/uploads/1/3/4/6/134661799/5213798.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kefixofelapadi.epizy.com/84970552690.pdfIn PDF document text
    • https://1eb42bdc-3da6-4b32-b75f-4382f1721f8e.filesusr.com/ugd/35474d_89b71ee56519474cb2ff34457ac18414.pdf?index=trueIn PDF document text
    • https://1ebfeea1-7d02-43b8-8f0a-002c87bc7f75.filesusr.com/ugd/50dcf6_840e2a16a99446beb8938c852b9ddaee.pdf?index=trueIn PDF document text
    • https://7737876a-f762-42ef-af6f-18b78abacabf.filesusr.com/ugd/9066bd_3a23955312a341eeb1d2525c2d8a774f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/020d3824-9c0a-4d2e-b3d8-2cd9dea51ae4/53140234493.pdfIn PDF document text
    • https://d427386d-3434-45d9-8802-370857a594f4.filesusr.com/ugd/accd1f_b382673d83f94be09ae01d5f4215455b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a8d7fa8-4b9e-4be1-be7c-b6e7dbe0f3ff/jikugebalutuji.pdfIn PDF document text
    • https://367e539a-c541-4439-991c-4bf2bef2aa7a.filesusr.com/ugd/77d535_07235de43d264c24a06f518d26f3b648.pdf?index=trueIn PDF document text
    • https://40e214c1-1950-44e8-a195-e2c6eeb23253.filesusr.com/ugd/a517f4_23ba4d68bdb045259a4680ff7a0f7a38.pdf?index=trueIn PDF document text
    • https://089130c0-62ae-4bf1-a93c-656440fe8451.filesusr.com/ugd/738632_add6c23799454b4f8aae129ab48f6209.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/72da1263-b825-47f1-8684-96fa639fc4bb/4207150052.pdfIn PDF document text
    • https://d54d55f4-8004-4613-9f19-7b96cbed0ae7.filesusr.com/ugd/ce4b32_4165fbcdd68f4e278380e930047c78a8.pdf?index=trueIn PDF document text
    • https://a3e8d6b6-68ee-4625-a313-a25a09dbd39d.filesusr.com/ugd/312e12_922a035e5f774ae9ae2e0627bf7e3b1f.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_off0000f2e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E7 5440 bytes
SHA-256: 086478755e87dffd688d476c29a0a9bf96b536f2f8c5036649250b6affdef2f7
font_01_sfnt_off00010587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10587 10180 bytes
SHA-256: 907def8c7cb98dabf345b8ca139d01b37a19129805f5d099a003186000c02279

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