Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa700e76d23d29ba…

MALICIOUS

PDF

75.6 KB Created: 2021-03-24 07:18:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d8223947cff07aecbe5d35a11498b430 SHA-1: cc69946093b0a4af0e985ed53165fe99259f8f62 SHA-256: aa700e76d23d29ba0ab95463328c17464f525c524e21970a0fe56642b947c56e
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing or SEO spam attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://mezovuduw.ru/strik?utm_term=the+mortal+instruments+city+of+ashes PDF link annotation
    • https://cdn.sqhk.co/vibisidumes/OXjghi9/repulsed_antonym_meaning.pdfIn PDF document text
    • https://cdn.sqhk.co/jisaside/QJrd0ii/where_did_you_go_meaning_in_punjabi.pdfIn PDF document text
    • https://cdn.sqhk.co/lusimalifa/Ujajcns/vejew.pdfIn PDF document text
    • http://digitalliteracyinstitute.com/irregular_verbs_list_english_frenchy5ius.pdfIn PDF document text
    • http://wacc-cat.org/riwisinavukib3hm.pdfIn PDF document text
    • http://lumacy.site/mutodijonoxubilesao3dm3.pdfIn PDF document text
    • http://1xbets-regs.site/the_ones_who_walk_away_from_omelas_criticism_of_utilitarianismvow54.pdfIn PDF document text
    • https://cdn.sqhk.co/jezaziritav/hhYSihP/temple_run_2_lost_jungle_android_game_download.pdfIn PDF document text
    • https://cdn.sqhk.co/gixejefi/072kdLZ/68969979134.pdfIn PDF document text
    • http://kinorio5.xyz/basic_italian_words_list942cx.pdfIn PDF document text
    • http://wownatural.fun/monthly_calendar_excel_formathu1fi.pdfIn PDF document text
    • http://rat-red.space/sojenuvopvn6uq.pdfIn PDF document text
    • http://tokio-2020.fun/zadafitisafekikasipiwmiihx.pdfIn PDF document text
    • http://5coupon.info/sennheiser_rs160_rs170_hdr_160_hdr_170_headphonesqe33f.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/542de6c1-7fef-4fbe-8a98-4cc72176ffae/13386882008.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21d01f92-ac82-452b-917e-d3a59b767dba/how_to_reset_a_harbor_breeze_fan_remote.pdfIn PDF document text
    • https://bf6af823-cb0d-4ee8-9d5b-4f0b1de5ed24.filesusr.com/ugd/9eb187_375fe89df90c4b8bbeace3b8851a2dce.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d17035b4-ff2a-4341-b22e-53a068cdb0db/63588050772.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/083ac2ae-f373-453e-b65e-9f646258048c/37059402845.pdfIn PDF document text
    • https://07d68bf2-0661-47e2-9ffe-eae068a071af.filesusr.com/ugd/fef806_04c80c9759f14b7187dcedf41efe0d0c.pdf?index=trueIn PDF document text
    • https://6c8ebe11-725c-420b-823a-68bc39d02ad2.filesusr.com/ugd/3e87bf_0de76e319b02454ca86e7abd9cabca03.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/345e3760-ca6e-4a68-9abc-d84981b238a8/pejadopubupoferodilol.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_off0000e942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE942 5172 bytes
SHA-256: 127b0f0022c85b360fef92b413d4cb47fbfd5275342ae4f968d36899ec6f5289
font_01_sfnt_off0000fab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB3 10592 bytes
SHA-256: 78434aa0d068708e0b23644d4b26bf0d37090c418ae5cb70acd7484483981192