Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf9eceb37a7913bd…

MALICIOUS

PDF

77.0 KB Created: 2021-02-28 18:04:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 34c0f465696aa5f3d4680bd99471266d SHA-1: 92e5170d492d2d6a98d266fbf0f6bf4dcf844354 SHA-256: cf9eceb37a7913bda990cf20596da5ad77e25b93918abb1fac6b3a9159a9c958
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing lure. The document body, though partially corrupted, contains text related to leaf blower repair, which is likely a pretext to drive users to the malicious external links.

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
  • 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://maypoin.ru/123?utm_term=why+won%2527t+my+leaf+blower+start PDF link annotation
    • https://cdn.sqhk.co/xufojidaju/T2idTBb/ninja_fighting_spree_game_download.pdfIn PDF document text
    • http://nopotaz.medianewsonline.com/mcculloch_chainsaw_pro_mac_10-10_parts.pdfIn PDF document text
    • http://pixilipe.22web.org/o_que__reforma_calvinista.pdfIn PDF document text
    • http://maretexojud.66ghz.com/amato_warranty_forever_reviews.pdfIn PDF document text
    • http://vidavubaxo.22web.org/50800530078.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387233/normal_60329554ba394.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479214/normal_5fc7b8185c0a8.pdfIn PDF document text
    • https://cdn.sqhk.co/wimedizi/ibwigjd/96936330827.pdfIn PDF document text
    • http://mumijivamivaxij.medianewsonline.com/76508307258.pdfIn PDF document text
    • https://litizabege.weebly.com/uploads/1/3/4/7/134713043/saxelimikekaxanidixa.pdfIn PDF document text
    • http://segijemidas.22web.org/vaver.pdfIn PDF document text
    • https://cdn.sqhk.co/najafizox/jgRwhel/premeditated_murder_used_in_a_sentence.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
    • http://ratobewiwigu.atwebpages.com/45583891977.pdfIn PDF document text
    • http://geforagegi.atwebpages.com/87303208596.pdfIn PDF document text
    • http://wikusonusi.rf.gd/differences_between_big_little_lies_book_and_tv_show.pdfIn PDF document text
    • http://zudosikewemer.epizy.com/26111267630.pdfIn PDF document text
    • http://zaruxokogidut.epizy.com/49885316640.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_off0000e22d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22D 5128 bytes
SHA-256: 7e6d87f13a0db44c0cbbdbef1b5964e515764a3b82a5f4eded102904bdb1030b
font_01_sfnt_off0000f381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF381 10844 bytes
SHA-256: 1c0cfb32b5462c6a0f25497d34d3abad029bde5593f729703d76262ed03ca4d9
font_02_sfnt_off0001185a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1185A 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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