Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cbf887d9068cc0d…

MALICIOUS

PDF

75.9 KB Created: 2021-05-19 10:55:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7780e42bddfc6a9eef1cbfcfe74ce14d SHA-1: 14187128c68a97e65dc55a0eddf202ac5268671d SHA-256: 9cbf887d9068cc0d0fbbc8f10a7f773164c3dc6b1770f145727c8f267ea5e927
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which appear to be part of an SEO link farm. The primary malicious URL identified is dafemum.ru, which is likely used to distribute further malicious content or phishing pages. ClamAV and ML heuristics confirm the malicious nature of the PDF, flagging it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/strik?utm_term=play+wheel+of+fortune+online+free+no+download
    • https://kezunegewekal.weebly.com/uploads/1/3/1/4/131483031/nidubaruderokubax.pdf
    • https://cdn-cms.f-static.net/uploads/4444623/normal_5fd9a041c63df.pdf
    • https://cdn-cms.f-static.net/uploads/4417208/normal_605b49f93d19d.pdf
    • https://jowetetezuvam.weebly.com/uploads/1/3/4/7/134717416/26e9ace.pdf
    • http://nubebukexowi.66ghz.com/waste_to_energy_research_papers.pdf
    • http://bezugunafagomup.22web.org/audio_to_text_apkpure.pdf
    • https://jenodaxadow.weebly.com/uploads/1/3/4/0/134012655/df9210.pdf
    • https://cdn-cms.f-static.net/uploads/4455658/normal_6065aae15da6e.pdf
    • https://cdn-cms.f-static.net/uploads/4472208/normal_604cde76b5370.pdf
    • https://cdn-cms.f-static.net/uploads/4454432/normal_605d937ef2805.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/2d2033f6-a831-49d4-a821-bf107673edb8/gutukezosirimozuwepiga.pdf
    • https://uploads.strikinglycdn.com/files/39e3febf-485b-46d1-9d60-2cde2b520c9f/79824860179.pdf
    • http://kilunebanuj.epizy.com/acca_paper_f1_notes.pdf
    • https://s3.amazonaws.com/mokixetat/what_to_write_in_godchilds_christening_card.pdf
    • http://zejawira.rf.gd/trumpet_transposition.pdf
    • http://garafukaralefa.epizy.com/infinite_flight_simulator_apk_mod_full.pdf
    • https://uploads.strikinglycdn.com/files/824cc42a-5668-4046-8ac0-6c4726a4d160/17045040809.pdf
    • https://uploads.strikinglycdn.com/files/ef714554-60f1-4041-bed0-cbe75e6741ec/momimawi.pdf
    • https://uploads.strikinglycdn.com/files/e01b01c4-d6d6-4ade-ae72-018025de8616/giwosavu.pdf
    • https://s3.amazonaws.com/pevuwarobuvowa/bluelinx_holdings_inc_annual_report.pdf
    • https://uploads.strikinglycdn.com/files/9968d054-d9cf-4c30-aaf3-c6de44dd5641/what_to_do_when_your_fire_tv_remote_stops_working.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecd7.bin
a9d8d03eef473445aa4a6645d2df541ea9bc63d586ec5e095becdaae99985992		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECD7 5012 bytes
font_01_sfnt_off0000fdf4.bin
1f5bb0bdb52935ec716b53a19aa0aa870df70cbc0cd871fb7c4ccd31c23a3a3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF4 10648 bytes

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