Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd295e0501d4f1e7…

MALICIOUS

PDF

82.1 KB Created: 2021-04-01 10:10:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 5cded4c42986dc828d0c1ff82cac88c1 SHA-1: 426b645a91777cb032b6aa0d4f123338939207d4 SHA-256: cd295e0501d4f1e724e6fbc3c5ff81482231634d21bab8577f228716de8ab28c
186 Risk Score

Malware Insights

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

This PDF document functions as a link farm, directing users to numerous external websites, many of which are hosted on disposable domains. The primary lure appears to be a search result for "how to make my exercise bike seat more comfortable", suggesting a phishing or malware distribution attempt. The presence of PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, along with a high ML classifier score and ClamAV detection, strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://dugedepap.ru/strik?utm_term=how+to+make+my+exercise+bike+seat+more+comfortable PDF link annotation
    • http://biwumani.mywebcommunity.org/acute_decompensated_heart_failure_adalah.pdfIn PDF document text
    • https://kosilamegorigi.weebly.com/uploads/1/3/1/4/131409210/6260444.pdfIn PDF document text
    • https://naxonefewu.weebly.com/uploads/1/3/5/9/135961026/tigiwalo-xefalud-dinasixupax-ledikusimix.pdfIn PDF document text
    • https://kobigaxa.weebly.com/uploads/1/3/3/9/133997295/852941.pdfIn PDF document text
    • http://lamaded.mywebcommunity.org/xekixoxubavesafosese.pdfIn PDF document text
    • https://buzalunila.weebly.com/uploads/1/3/1/6/131606025/fikar-nagogesoxopuz.pdfIn PDF document text
    • https://fikijumosoliz.weebly.com/uploads/1/3/5/4/135400707/farinisoxatu-sigog.pdfIn PDF document text
    • https://verumoxozuvije.weebly.com/uploads/1/3/1/4/131407377/zofujalafagu-janezitudinebij-tazopidogatefuw.pdfIn PDF document text
    • http://mavpa.fun/understanding_yourself_and_othersc4tcw.pdfIn PDF document text
    • https://fawitazekivaji.weebly.com/uploads/1/3/1/4/131454143/kezamokejokigegeg.pdfIn PDF document text
    • http://pristav.pro/oecd_glp_guidelines_pptmuhim.pdfIn PDF document text
    • http://4bochki.ru/android_developer_snackbar_example2a027.pdfIn PDF document text
    • https://govoxarenaja.weebly.com/uploads/1/3/4/8/134874143/67560.pdfIn PDF document text
    • http://disconto50.pro/minister_license_ohio_onlinermzum.pdfIn PDF document text
    • http://pakunobun.getenjoyment.net/wedojup.pdfIn PDF document text
    • http://loxupuf.mygamesonline.org/fodigufawanu.pdfIn PDF document text
    • https://bukodebavuv.weebly.com/uploads/1/3/4/6/134657655/fidasegitajivetox.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://kuwitabetegipo.myartsonline.com/les_miserables_characters_2012.pdfIn PDF document text
    • http://nibizuladode.onlinewebshop.net/72437283241.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1f84c76-3a7d-48cd-b8f4-99b5c26cf840/description_of_a_rainstorm.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d9e1c9d-db2a-4f42-a93a-110c52cf893e/the_first_georgians_the_german_kings_who_made_britain_episode_2.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DD 5136 bytes
SHA-256: 38bbd8a9bf5c5c4e4e9e1d86b01505c9bde85996b2ebc365d42eaa1c6c5ddb42
font_01_sfnt_off00010771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10771 10812 bytes
SHA-256: 97b3b75b79c8bea7ba67e695f0a62c109cc4e1cffb02f089294bc9e245cdeb48
font_02_sfnt_off00012c3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C3C 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c