Malicious PDF — malware analysis report

Static analysis result for SHA-256 53da58f3197168e6…

MALICIOUS

PDF

72.7 KB Created: 2021-05-11 10:43:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f5f4dfaa910a53fd61a92dac0f46c7ef SHA-1: 12467ab6286b789be060c27d5aa12278f76424b1 SHA-256: 53da58f3197168e610cb82695b3ae9e338cb28775c65cd7401b4d9923518f8c6
186 Risk Score

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://gimoguvi.ru/strik?utm_term=how+to+go+about+building+your+own+home PDF link annotation
    • https://gujowidupisume.weebly.com/uploads/1/3/4/1/134131448/nododewe.pdfIn PDF document text
    • http://xanimupa.22web.org/lepidoptera_species.pdfIn PDF document text
    • https://jobalexaxikut.weebly.com/uploads/1/3/4/8/134892204/wizilek.pdfIn PDF document text
    • https://cdn.sqhk.co/tiruxugajo/BSyibQ7/batman_arkham_origins_apk_unlimited_money.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420238/normal_605efb5232603.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404520/normal_606dc61099f63.pdfIn PDF document text
    • https://lokeduvedip.weebly.com/uploads/1/3/4/8/134885922/476706.pdfIn PDF document text
    • https://cdn.sqhk.co/tipekafomube/iTwowjh/nodom.pdfIn PDF document text
    • https://cdn.sqhk.co/jalosemuv/RWgiQjc/stick_fight_the_game_mobile_mod_apk_download.pdfIn PDF document text
    • https://gumabudisipinef.weebly.com/uploads/1/3/2/7/132712006/3991a93.pdfIn PDF document text
    • https://tatunuzaxu.weebly.com/uploads/1/3/4/5/134596213/38f0def693a17.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/kufazete/backtrack_wifi_hack_free_for_windows.pdfIn PDF document text
    • https://s3.amazonaws.com/budovewesekaz/bounce_tales_nokia_mod_apk.pdfIn PDF document text
    • http://loratozojakin.epizy.com/xufota.pdfIn PDF document text
    • https://39c1d623-eccb-4af0-a86a-15328a2d61f9.filesusr.com/ugd/3cb6cb_4271df0b7ea344af9a4c153bf544705f.pdf?index=trueIn PDF document text
    • https://62abf401-5fc9-4991-ac00-cb6a0c8cf8ec.filesusr.com/ugd/e4ff69_23a9c7e30ce94712ba6b1c0f6f3d48b3.pdf?index=trueIn PDF document text
    • https://425e2ee7-996f-4c6d-a593-b44a2a39b733.filesusr.com/ugd/bb05c1_d5a31b5ff33d42369d6270479135e55b.pdf?index=trueIn PDF document text
    • https://535a9070-e28a-464b-adc5-c02ad08be00b.filesusr.com/ugd/9df9d6_fce17eb760064492b3f5a57634e80df1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/busutafitufe/4354369728.pdfIn PDF document text
    • https://0dea665b-aaaa-42f3-a52c-f86f0fd1efa2.filesusr.com/ugd/8b9728_20aa3a104702418d89db57c04dabf274.pdf?index=trueIn PDF document text
    • http://lilinujazet.rf.gd/replace_battery_accutime_watch.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_off0000ddd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD1 5356 bytes
SHA-256: 10bcb1e309f9be53371dc71f234fe4752aada303224cbd6a915c488b036d0079
font_01_sfnt_off0000eff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF1 11588 bytes
SHA-256: df2b3f5276c243b29f94333749f930e1b991f01b1dc449641e4706a80b6e9d26