Malicious PDF — malware analysis report

Static analysis result for SHA-256 d89b64d5d34480eb…

MALICIOUS

PDF

107.5 KB Created: 2021-03-10 00:00:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c31e548a340c15ffabaecd708d100b87 SHA-1: 1551913a389ee2bbf812031ae30d800848db8e2d SHA-256: d89b64d5d34480ebf39c679dbdf99abffd985a565073681a179b13b2c96dbffd
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://soxebez.ru/strik?utm_term=astra+militarum+codex+8th+edition+amazon PDF link annotation
    • https://pezazexumazu.weebly.com/uploads/1/3/5/3/135392870/1cc429aa05.pdfIn PDF document text
    • https://cdn.sqhk.co/sarunasol/Bhhrpig/91993922701.pdfIn PDF document text
    • https://cdn.sqhk.co/devuzemalut/hujh2we/97591959224.pdfIn PDF document text
    • http://cosmostil.top/78075687027pwzq3.pdfIn PDF document text
    • http://gejodumegemato.22web.org/70828627638.pdfIn PDF document text
    • http://copyright-helps-team.com/how_to_teach_yourself_self_control_with_foodmtx02.pdfIn PDF document text
    • https://cdn.sqhk.co/musutalivun/jehgcRx/41519081108.pdfIn PDF document text
    • http://d2-club.ru/defowazufowifumiteloo0tx.pdfIn PDF document text
    • https://biwewonopegad.weebly.com/uploads/1/3/1/3/131380063/7170580.pdfIn PDF document text
    • https://cdn.sqhk.co/tamupoto/jhjihzU/paribib.pdfIn PDF document text
    • https://sidugavumudoriz.weebly.com/uploads/1/3/4/9/134902227/36f304c606c2b8.pdfIn PDF document text
    • https://cdn.sqhk.co/tuledapozato/bowijjd/at_t_phone_says_emergency_calls_only.pdfIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e799997-a419-4c7d-98c7-2a8b391d742b/64828937456.pdfIn PDF document text
    • http://segalemu.epizy.com/12215802054.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/688b3737-fb59-4d41-b00f-7f2d526b9d52/ge_dehumidifier_adel70lrl2_manual.pdfIn PDF document text
    • http://rimalapotozuf.epizy.com/datasheets_of_bno055.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://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00014c1f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14C1F 17316 bytes
SHA-256: acd29f4f5ff1b2f633ac538c131a98fcad7e9ecb73554d439cb701e2e1c48870
font_00_sfnt_off000139aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139AA 5480 bytes
SHA-256: a0ae369aafaf3a4d1cb9b21c961899f4186cd202698e754382f0d245d5fc8390
font_02_sfnt_off00017ae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17AE6 11136 bytes
SHA-256: 0f8f1a700a42c1030732f33489c88afea57e24abe90965a630fbdfdc7c5e7fa4

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