Malicious PDF — malware analysis report

Static analysis result for SHA-256 8947cae57b28a301…

MALICIOUS

PDF

80.3 KB Created: 2021-03-20 14:58:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 9245a92235caa9f31e7fc51d10c74483 SHA-1: 7406cbeb5aa7a17e1f857a7d437d9722e32ff72a SHA-256: 8947cae57b28a301cb227f310d460de235c41c923a53001c535a253993171619
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, indicative of a link farm or phishing operation. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs point towards a malicious document designed to redirect users to potentially harmful content.

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://golowaki.ru/123?utm_term=kerala+blasters+hd+photos PDF link annotation
    • https://cdn.sqhk.co/vibisidumes/hFLe3ii/cruise_out_of_galveston_march_2020.pdfIn PDF document text
    • http://fikosarodone.medianewsonline.com/mini_cooper_service_manual.pdfIn PDF document text
    • https://sowotelimavo.weebly.com/uploads/1/3/4/0/134000290/pujuli-kejogarejera.pdfIn PDF document text
    • https://cdn.sqhk.co/poniroxam/hjAiaW4/koxulatob.pdfIn PDF document text
    • https://cdn.sqhk.co/dasulujina/aQPoicw/sojujeligodofopu.pdfIn PDF document text
    • https://finuvowevemez.weebly.com/uploads/1/3/5/3/135397693/gijudimigol_doruxadu.pdfIn PDF document text
    • http://nageramuvepom.mywebcommunity.org/banikinexonugukogizena.pdfIn PDF document text
    • https://cdn.sqhk.co/xataruzepape/s1Jgeka/77590282614.pdfIn PDF document text
    • https://cdn.sqhk.co/kitujesijak/dgcEOhi/jimosukelururu.pdfIn PDF document text
    • https://cdn.sqhk.co/sewuvavimebi/hhigibu/cross_stitch_patterns_flower_fairies.pdfIn PDF document text
    • https://cdn.sqhk.co/gadukupuwe/rgfd4if/82939961019.pdfIn PDF document text
    • https://cdn.sqhk.co/mujejadalale/hKhAUhj/sosigazatelibivepodod.pdfIn PDF document text
    • https://galofufe.weebly.com/uploads/1/3/1/3/131384583/37cbda6296e900.pdfIn PDF document text
    • https://nolizusumebixaz.weebly.com/uploads/1/3/1/4/131438071/vamixirelux-nininojepikedun-padevopikizi.pdfIn PDF document text
    • https://ganepivojo.weebly.com/uploads/1/3/4/7/134774155/d6822167653411b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/werowibovezoje/missguided_bandeau_fishtail_maxi_dress.pdfIn PDF document text
    • https://s3.amazonaws.com/dubiditiginowo/aambala_movie_song_isaimini.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0003703d-d2c2-4ff6-9116-2266602ad217/burger_king_fries_nutritional_value.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1f3a0f2-afd7-4c7a-a2d9-1032040750ca/suing_a_county_judge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b4d0976-5d23-475d-a949-3c27f79cecd8/mopuba.pdfIn PDF document text
    • https://s3.amazonaws.com/fajujiju/matlab_genetic_algorithm_toolbox_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/wujafivabipo/teduvegep.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC6 4792 bytes
SHA-256: 619c081ee107f8e128306e0126a36e1c9ad47c64d11e25222289b092664017aa
font_01_sfnt_off0000ff19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF19 11320 bytes
SHA-256: 25d6cab962f37016247cc5e435fb9343e45376138fcf60364b9b1507ffd33adf
font_02_sfnt_off0001259c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1259C 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230