Malicious PDF — malware analysis report

Static analysis result for SHA-256 a55500a06c70be6c…

MALICIOUS

PDF

81.9 KB Created: 2021-03-03 09:46:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 5e3213849931034a75c3bdab2a63bb43 SHA-1: 2bc5502b35a4b3828b7e685a5c8d68eb1d48a3ab SHA-256: a55500a06c70be6c045e93ec190cd8626c0d699db1663c2c4631357a90205512
134 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one prominent URL pointing to a suspicious domain that appears to be part of a link farm. The PDF's structure and the presence of embedded URLs suggest it is designed to redirect users to potentially harmful websites, likely for phishing or to download further malicious 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/wix?keyword=dipper+and+mabel%2527s+guide+to+the+unexplained PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4453907/normal_6038b7799e594.pdfIn PDF document text
    • https://xuxukiworizep.weebly.com/uploads/1/3/4/7/134723333/wekun.pdfIn PDF document text
    • http://vevaxogejaz.scienceontheweb.net/96265789433.pdfIn PDF document text
    • http://tomokatixo.mygamesonline.org/how_much_money_did_george_foreman_make_off_the_george_foreman_grill.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403539/normal_600b62664933d.pdfIn PDF document text
    • https://vajubepodeno.weebly.com/uploads/1/3/0/7/130776779/doxup-weteso.pdfIn PDF document text
    • https://niraniki.weebly.com/uploads/1/3/4/6/134662237/ebe34def.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451355/normal_5fce3118c504c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405179/normal_600d386704a31.pdfIn PDF document text
    • http://metryck.info/76973011783h4zfm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483103/normal_60214f04a473b.pdfIn PDF document text
    • http://sizegoduxuxa.mygamesonline.org/potassium_hydroxide_strong_or_weak_acid.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://finuzajobozosom.epizy.com/rijegi.pdfIn PDF document text
    • http://nufukajipopo.rf.gd/musejuxixexepajulebutet.pdfIn PDF document text
    • http://tadezaxe.rf.gd/88995307644.pdfIn PDF document text
    • http://zikofizoredu.rf.gd/60719136824.pdfIn PDF document text
    • http://nizowozutagele.atwebpages.com/94466824759.pdfIn PDF document text
    • http://watuginidimefil.epizy.com/raketapad.pdfIn PDF document text
    • http://tajujuzedil.epizy.com/what_is_non_conformance_in_iso_9001.pdfIn PDF document text
    • http://muvabeso.epizy.com/rv_awning_fabric_replacement_instructions_youtube.pdfIn PDF document text
    • http://noderisaxe.rf.gd/xonesikatabukubivijus.pdfIn PDF document text
    • http://mevetilozavasep.epizy.com/jelawinitom.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_off0000f376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF376 5496 bytes
SHA-256: 7658964d89f08dd1116949d040c89cfcc39f6d0979d8f0ee39783881ac227c77
font_01_sfnt_off000105f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F8 11508 bytes
SHA-256: da8fa0d0e56d8b55c0f721e9af7e87781bc7ab6c6eaf4e8c382990e1bc1b6d56
font_02_sfnt_off00012bbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BBF 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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