Malicious PDF — malware analysis report

Static analysis result for SHA-256 85604d777a70bb0a…

MALICIOUS

PDF

66.7 KB Created: 2021-03-29 09:00:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 382bfa8f4c84edf497bf089954e7d750 SHA-1: 5011ec4776025adf66f06199fc0fa2e95045b5a2 SHA-256: 85604d777a70bb0a7a47315eefea1219fd80d8d7bf48a2e7800cff8ebed6d53f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

Heuristics 5

  • 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 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://jumiwimov.ru/strik?utm_term=minna+no+nihongo+1+audio+cd PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4386095/normal_601e56c76c08d.pdfIn PDF document text
    • http://redita.fun/80953849924ujhkh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495691/normal_60397a13aab95.pdfIn PDF document text
    • http://mapotilij.mygamesonline.org/13571610167.pdfIn PDF document text
    • http://nadefememidep.medianewsonline.com/ballistic_galvanometer_experiment.pdfIn PDF document text
    • http://pocki.top/petigaf764rk.pdfIn PDF document text
    • http://gepokupaburorew.mywebcommunity.org/rozelodurilopovutoruxami.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450260/normal_6057fe701072a.pdfIn PDF document text
    • http://fimewot.xyz/spelling_practice_book_grade_6_answershei1c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480414/normal_5fe3bb56c3991.pdfIn PDF document text
    • http://xewitanajudozu.iblogger.org/how_to_connect_canon_printer_to_wifi_mx492.pdfIn PDF document text
    • http://sportplays.ru/vutawadobivulesajsapda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446499/normal_6032713b3f533.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/kuboki/lenovo_g50-45_80e3_battery.pdfIn PDF document text
    • http://luzawuwu.epizy.com/78498862467.pdfIn PDF document text
    • http://mapakifexi.rf.gd/14881828889.pdfIn PDF document text
    • https://s3.amazonaws.com/zetituri/bally_s_las_vegas_map.pdfIn PDF document text
    • https://s3.amazonaws.com/pokixovuxik/7425166780.pdfIn PDF document text
    • https://s3.amazonaws.com/firudegix/7189856512.pdfIn PDF document text
    • http://gutuxujerulobed.epizy.com/verbal_reasoning_questions_for_class_3.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_off0000c85e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC85E 4952 bytes
SHA-256: de01521685ef03de221b8e75cae80efba12e25d10e76e73baf3c8552f4b3f091
font_01_sfnt_off0000d94e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD94E 10352 bytes
SHA-256: 89de233a491338c14360c585f2b7579a6e3f3f4639f51664e8a5d09cdb9d42db