Malicious PDF — malware analysis report

Static analysis result for SHA-256 97787264863d43a2…

MALICIOUS

PDF

85.1 KB Created: 2021-03-05 16:58:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 9fbda7f74b82ccafcb8fa3e718da75a4 SHA-1: f8f1bb0ed8a4a3f9843f098651a1512be0a05bc7 SHA-256: 97787264863d43a2bb62227436d9f30cd67e533457c8ac0cbf60375f7b8ea098
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, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and numerous external links point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/wix?keyword=dragon+ball+z+flash+games+unblocked PDF link annotation
    • https://wabavavopip.weebly.com/uploads/1/3/4/3/134317653/7af4720f.pdfIn PDF document text
    • http://wojisub.mypressonline.com/bimami.pdfIn PDF document text
    • https://mafetoga.weebly.com/uploads/1/3/0/8/130874134/399ff0d.pdfIn PDF document text
    • https://cdn.sqhk.co/pigalixow/hdAoXjj/sixeduzewisu.pdfIn PDF document text
    • http://fopokigife.mywebcommunity.org/bezutupisusinekotajabo.pdfIn PDF document text
    • https://fefugenaxidoseb.weebly.com/uploads/1/3/1/3/131380158/1862224.pdfIn PDF document text
    • http://zexaribamemavi.sportsontheweb.net/fujapumemojukufuxer.pdfIn PDF document text
    • https://cdn.sqhk.co/kitujesijak/Uicifhi/bazirute.pdfIn PDF document text
    • http://nakekizedexu.getenjoyment.net/tascam_recorder_review.pdfIn PDF document text
    • https://cdn.sqhk.co/gowamojon/shbge5x/zejifanejigugowog.pdfIn PDF document text
    • https://cdn.sqhk.co/buvaboda/9UhjaYB/new_malayalam_romantic_song_ringtone_download.pdfIn PDF document text
    • http://xuzerujagojagip.scienceontheweb.net/itll_be_alright_meaning.pdfIn PDF document text
    • http://vozivovog.scienceontheweb.net/does_tracfone_have_a_speaker.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487626/normal_60302e0ddfa5c.pdfIn PDF document text
    • https://dudegakabiwuzab.weebly.com/uploads/1/3/1/4/131406663/5499746.pdfIn PDF document text
    • https://zopamege.weebly.com/uploads/1/3/5/9/135966764/jixifobikulalilubi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382197/normal_602141dbd896c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9f503c4c-bf14-4dcb-9a7a-68e0e5bb3568.filesusr.com/ugd/8ac1ab_b0ab35a173ab4f19b0dc96ee994f3133.pdf?index=trueIn PDF document text
    • https://2a403a33-5f6e-4534-96f9-742aa7325afc.filesusr.com/ugd/d2da83_ae3e2116dc9849c1a2929ff202de85dc.pdf?index=trueIn 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_off0001031b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1031B 3956 bytes
SHA-256: 49f5b60f05d1a6eb924cc0e52c4ac46d956e949974681470982ee8a0791de833
font_01_sfnt_off000110e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E9 5688 bytes
SHA-256: 81ba1ea85f2eb5e84a52956b9f0253f34ce81689bc35aa05d34e4e62ee11b992
font_02_sfnt_off00012425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12425 10116 bytes
SHA-256: e29f04123866eb7fcb4621e1a18a7d0bfe99131353b26af3b2272b1dcb47fc37