Malicious PDF — malware analysis report

Static analysis result for SHA-256 1671eb748934cbde…

MALICIOUS

PDF

74.8 KB Created: 2021-02-15 22:21:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a6aae14ccd57c70743d9836e4de1ca46 SHA-1: c0d82d3061855fee435f758ae31d40fdaf4bdfb4 SHA-256: 1671eb748934cbde892c958415d7db8d18c9f272d2aa394dfd2a19897442fdf3
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. The primary URL suggests a lure for downloading drivers, a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/wb?keyword=dell%20precision%20t7500%20drivers%20download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4450516/normal_600385af29201.pdfIn PDF document text
    • http://jadivaza.iblogger.org/58379308148.pdfIn PDF document text
    • http://gotedez.22web.org/autocad_app_for_windows_10.pdfIn PDF document text
    • https://tekevifumufov.weebly.com/uploads/1/3/0/7/130739519/78c838f49d.pdfIn PDF document text
    • http://fesigemujelepir.66ghz.com/jukufipavide.pdfIn PDF document text
    • http://gunodopo.22web.org/vejixakezedupovazurage.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500674/normal_60142722e2883.pdfIn PDF document text
    • https://wumefabifu.weebly.com/uploads/1/3/4/8/134888429/882c5900f4d0.pdfIn PDF document text
    • https://cdn.sqhk.co/wixumenez/Tpjfiew/17507265012.pdfIn PDF document text
    • https://fedalovojuxunod.weebly.com/uploads/1/3/0/7/130775560/7853504.pdfIn PDF document text
    • https://cdn.sqhk.co/kugefiruxat/ghdhjgT/79314537028.pdfIn PDF document text
    • https://xijapesulole.weebly.com/uploads/1/3/4/5/134588017/lumixuwesez_xoxewopemib_megexepabezu.pdfIn PDF document text
    • https://cdn.sqhk.co/zonelatu/iarLQji/ms._holmes_the_monster_of_the_baskervilles_collectors.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484114/normal_5fd88d5b94434.pdfIn PDF document text
    • https://cdn.sqhk.co/zenekukera/eTbihjh/zutebap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426072/normal_5fe721c3b7d57.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://punonawu.rf.gd/88468094732.pdfIn PDF document text
    • http://zasegusof.epizy.com/types_of_camera_shots_and_angles.pdfIn PDF document text
    • http://tinosizifaxuful.epizy.com/stalker_call_of_pripyat_mods_deutsch.pdfIn PDF document text
    • http://mesuwepuru.epizy.com/57050454530.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_off0000e646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE646 5564 bytes
SHA-256: d6e5228f706b2f98cc3e60f63a2b4e277b5ba0098c8e5ebf779956dbecf3c4e2
font_01_sfnt_off0000f966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF966 10660 bytes
SHA-256: 3696ad5f0e8400ebed245410e1760969fea7a2ec20de24394c388a6ee3506c9a

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