Malicious PDF — malware analysis report

Static analysis result for SHA-256 85cb6c8b1e7fcd82…

MALICIOUS

PDF

73.8 KB Created: 2021-03-18 09:13:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 90930efe16be38cf7bca14cb02c20b72 SHA-1: eba71df5c4df29621c5154b7525aa27b0d68f73c SHA-256: 85cb6c8b1e7fcd82b95bef3bc8849d57d072dab64d2aad28331c6f81193d6c7d
186 Risk Score

Malware Insights

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

The file is a PDF containing numerous external links to disposable domains, identified as a link farm. The ML classifier and ClamAV detection strongly indicate maliciousness. The presence of external URIs and the link farm heuristic suggest the document's purpose is to redirect users to potentially malicious content, possibly phishing or malware. No scripts were extracted, but the PDF structure itself is indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?utm_term=abc+reporter+linzie+janis PDF link annotation
    • https://mizewipexu.weebly.com/uploads/1/3/4/6/134609608/4416534.pdfIn PDF document text
    • https://kegozogoro.weebly.com/uploads/1/3/4/5/134525602/jenirejefunipof.pdfIn PDF document text
    • https://ganepivojo.weebly.com/uploads/1/3/4/7/134774155/kugoseb.pdfIn PDF document text
    • https://cdn.sqhk.co/lakekomum/UthfjcY/flights_to_puerto_rico.pdfIn PDF document text
    • https://cdn.sqhk.co/vesagivara/icNiahc/79667341586.pdfIn PDF document text
    • https://cdn.sqhk.co/bemaxopig/lMiijbk/xizebapomawirajafu.pdfIn PDF document text
    • https://dusadekare.weebly.com/uploads/1/3/5/9/135993409/fekomobuno_tupoboruk_batonomibivezu_mujenuz.pdfIn PDF document text
    • http://lodomujimujug.mywebcommunity.org/kapodip.pdfIn PDF document text
    • https://popiliguji.weebly.com/uploads/1/3/4/2/134265512/vedixim.pdfIn PDF document text
    • http://xafesuvorolivig.scienceontheweb.net/kovifatewor.pdfIn PDF document text
    • http://bewewafip.scienceontheweb.net/38304133312.pdfIn PDF document text
    • http://nosumiva.mywebcommunity.org/7811076482.pdfIn 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/46d10db0-a71c-4aeb-b7ee-e9240f664f29/what_is_the_4th_step.pdfIn PDF document text
    • https://s3.amazonaws.com/winumigutam/45557459832.pdfIn PDF document text
    • https://s3.amazonaws.com/tawovojo/26195433415.pdfIn PDF document text
    • https://cd29ef07-728f-4a0b-b57b-23e770395c36.filesusr.com/ugd/f14cf6_1e965f74a227414783d5166c07e95fdf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9dead763-7857-440f-ad1d-b348ace38335/how_to_play_cyberpunk_2020_online.pdfIn PDF document text
    • https://da18e6a8-d720-42de-a88c-3f13daad7efb.filesusr.com/ugd/08fe48_1192efbb8e6f43d6a16860aa1ff93fa7.pdf?index=trueIn PDF document text
    • https://fe2b84af-b373-48e0-a714-f820169e3fe9.filesusr.com/ugd/ed1d2e_5aa3144ff8624a93aff9347450c56565.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kizugokofo/29347950493.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b3fd40a-e2fe-40e7-9006-3c74147ec467/35824402954.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21fe0453-700f-4240-8691-293bf2e8cd4e/strategies_for_technical_communication_in_the_workplace_4th_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/gofilafixu/90063954881.pdfIn PDF document text
    • https://adc0bc6f-2b4d-4951-bce0-9128d215fa34.filesusr.com/ugd/5ea4d5_0d37caa1bd3d46b2b7dbef4e81d094be.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_off0000dfdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDF 5180 bytes
SHA-256: b84743793478df1821636ff29dec86cf38244e8efba7f9d43af2eded5f3aabb7
font_01_sfnt_off0000f194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF194 11276 bytes
SHA-256: c51caf62c0ada412c81c099fe5880f54ec6c2ddbc072c5546152ac13da15599b