Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bffa90b8571db2d…

MALICIOUS

PDF

77.9 KB Created: 2021-03-12 11:44:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 73b6577c675a452708abe6fa1fa53259 SHA-1: 771a27eb9a925822d3c3031766e6347e927f6dc7 SHA-256: 7bffa90b8571db2d2c72e03a4bb4d3936d82b2acd2fecee32d557d0623956476
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or redirection scheme. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a high volume of outbound links designed to manipulate search engine results or lead users to malicious sites. ClamAV also detected this file as 'Pdf.Phishing.Trojan'. The embedded URLs and the nature of the link farm strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://druttle.ru/award?keyword=relative+clause+worksheet+pdf+with+answers PDF link annotation
    • https://cdn.sqhk.co/parikozug/hfgddic/dagaxalofegirasalipakuk.pdfIn PDF document text
    • https://cdn.sqhk.co/mepapogivoma/idhahit/ribanufenitawomirubunir.pdfIn PDF document text
    • https://cdn.sqhk.co/sikereri/jggh2ig/94972922831.pdfIn PDF document text
    • https://cdn.sqhk.co/rovonoset/a8EtrLY/kid_rock_songs_cowboy_lyrics.pdfIn PDF document text
    • https://cdn.sqhk.co/vesagivara/KrifJhi/dilamogazixago.pdfIn PDF document text
    • https://cdn.sqhk.co/vutenugade/i9gg6hd/sirujamiludekokitodamim.pdfIn PDF document text
    • https://cdn.sqhk.co/dedogupazib/Gghifhj/hmrc_self_assessment_tax_return.pdfIn PDF document text
    • http://lady-bug.club/rapejopolokozononik3z67l.pdfIn PDF document text
    • https://cdn.sqhk.co/sesekopusoj/cdgN5hb/followers_app_instagram_safe.pdfIn PDF document text
    • https://cdn.sqhk.co/wuzutuse/3PThb69/saziwokivogirafu.pdfIn PDF document text
    • https://cdn.sqhk.co/gunuzuli/Mhejgia/poe_elementalist_build_arc.pdfIn PDF document text
    • http://crispyset.online/the_four_fold_waypkd24.pdfIn PDF document text
    • http://helplnstagramcontact6088758.com/tower_defense_simulator_roblox_live_eventhg9e2.pdfIn PDF document text
    • https://cdn.sqhk.co/kurotevu/5uMhhge/trap_adventure_2_speedrun_walkthrough.pdfIn PDF document text
    • http://brumbum3.xyz/bosch_tassimo_coffee_machine_instruction_manual3lwfr.pdfIn PDF document text
    • https://cdn.sqhk.co/lebudawojafi/jb8Mlha/durowosigofiwogatorap.pdfIn PDF document text
    • https://cdn.sqhk.co/zetoreli/hdgchgj/i_peel_good_app_review.pdfIn PDF document text
    • http://basvuruizleme.online/4251936380vy5tp.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/cb4a43a3-3b2f-4c02-a6bb-7759099dfffd/72341255820.pdfIn PDF document text
    • https://b2d1eea7-aef5-47fc-962c-88b5513ecafc.filesusr.com/ugd/3a57bc_8fb8495bd2484c21ac76e4660b10bba1.pdf?index=trueIn PDF document text
    • https://0c2a7d7b-be9d-4ef2-a94c-09ca905cc17d.filesusr.com/ugd/7d21c0_57fedabb594742e5bd2f4c91293dd606.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/89a108e8-452f-4790-95cb-e3817fc0baa6/maytag_quiet_series_100_not_draining.pdfIn PDF document text
    • https://ec560393-4650-4708-bf0c-d08fceb8458c.filesusr.com/ugd/ca69db_11278871c0834373b9083de614fb0dd9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e2677be-88d7-4740-93cf-feb086aa2439/12637428360.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85038704-0d80-42cc-89be-0d9fc99eed83/20565534075.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b94bbdc-69d3-41a1-aeb8-a85612ea500d/84625969803.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_off0000f2e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E3 5468 bytes
SHA-256: 9ebaf0b8f4bb0dd0fb2c4f4396a2008f46d74cb59cf5e25510ce8231c5a4161a
font_01_sfnt_off0001058f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058F 10428 bytes
SHA-256: 27331ac53c85e7269079f3ceab5b4663bf5fe45de9b0cf967720aa182bce6310

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