Malicious PDF — malware analysis report

Static analysis result for SHA-256 8334cdf857dd8693…

MALICIOUS

PDF

66.7 KB Created: 2021-02-25 17:56:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 168610620c99659655a4ed48fdd3e7e7 SHA-1: db2ced6bc336f0ed602c0910fcf5ba398412b52d SHA-256: 8334cdf857dd86933307e74d46ca5e7cb84706bc5ac7e43ea23fa7926e188b98
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and redirector infrastructure, indicating a phishing or malicious redirection attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were extracted, the presence of malicious links and the document's structure as a link farm point towards an attempt to lead users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/123?utm_term=2020+honda+rebel+500+abs+for+sale+near+me In PDF document text
    • http://4kuhd.me/freeletics_workout_routinewke6z.pdfIn PDF document text
    • http://wejuzofibab.medianewsonline.com/how_to_get_rid_of_red_acne_spots_on_face_fast.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412758/normal_602f17dca8719.pdfIn PDF document text
    • http://rugegav.mywebcommunity.org/gadotobatupilupux.pdfIn PDF document text
    • http://teplotronic.ru/80582128012rlor7.pdfIn PDF document text
    • http://mutujejeturuduf.medianewsonline.com/42781566816.pdfIn PDF document text
    • http://tafugegajotu.mygamesonline.org/firex_hardwired_smoke_detector_installation.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kakasis.onlinewebshop.net/cuisinart_coffee_maker_ss_700_problems.pdfIn PDF document text
    • https://s3.amazonaws.com/lumixi/pipexe.pdfIn PDF document text
    • https://s3.amazonaws.com/wixanarer/29934646072.pdfIn PDF document text
    • http://kefujuvaw.epizy.com/request_for_scholarship_template.pdfIn PDF document text
    • https://s3.amazonaws.com/likadojivivofu/wifojavamiv.pdfIn PDF document text
    • http://tiluxusimutine.atwebpages.com/mens_vans_old_skool_black_and_white_checkerboard.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_off0000c717.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC717 5588 bytes
SHA-256: 46327078dbdd9142933b1952f805d74e8b00e7f4d3705414b2d599928919fca9
font_01_sfnt_off0000d9e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E9 10496 bytes
SHA-256: 1d86fa1b75e8b87dbd190b2eb04976c427da198fdae325340022d2a5cec59795

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