Malicious PDF — malware analysis report

Static analysis result for SHA-256 8aec84f08e4c6c9f…

MALICIOUS

PDF

79.2 KB Created: 2021-03-08 06:31:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: eb9c5da2c7346dbb13082fe122d0d464 SHA-1: 721dd18baad5ab48b4ecf999a79d43d5d5a5bacc SHA-256: 8aec84f08e4c6c9fa566b948ecd5363e681d8dea7bb55dcb679b90707deefbb4
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagging it as a PDF redirector and a link farm. The embedded URLs point to known malicious infrastructure and disposable hosting, suggesting an attempt to lure users to malicious sites. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a phishing or trojan delivery intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • 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 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.
  • 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://dafemum.ru/wix?keyword=the+girl+on+the+train+pdf+archive In PDF document text
    • http://form-lnstagramverifiedbadges.com/silence_is_the_language_of_god_all_else_is_poor_translationd0aoi.pdfIn PDF document text
    • https://cdn.sqhk.co/jolodovi/icGYv0g/merak.pdfIn PDF document text
    • https://cdn.sqhk.co/wemorapi/jcjbiim/petosizezozarowira.pdfIn PDF document text
    • http://zdorovienashevse.xyz/nail_salons_take_walk_ins44gv1.pdfIn PDF document text
    • https://cdn.sqhk.co/xexanodu/glV4igd/pabunoloduvijepuvaxukesim.pdfIn PDF document text
    • https://cdn.sqhk.co/denirinodo/dziodhd/sevosanifugotenofizofipos.pdfIn PDF document text
    • https://cdn.sqhk.co/kukisigafumi/bvighdi/r22_helicopter_for_sale_craigslist.pdfIn PDF document text
    • http://milanomodaitaly.site/how_to_game_bumble_algorithmmqr09.pdfIn PDF document text
    • https://debovibeki.weebly.com/uploads/1/3/4/7/134715081/2006193.pdfIn PDF document text
    • https://cdn.sqhk.co/giwitosak/fcicLtp/25681470452.pdfIn PDF document text
    • https://wupixizot.weebly.com/uploads/1/3/5/3/135398135/tejobamajen.pdfIn PDF document text
    • https://cdn.sqhk.co/gadewekunel/hazAjjm/81042945432.pdfIn PDF document text
    • https://nokurujifeseg.weebly.com/uploads/1/3/4/3/134355409/1824b.pdfIn PDF document text
    • https://watorixaziju.weebly.com/uploads/1/3/4/5/134586039/bodemol.pdfIn PDF document text
    • https://pimapavidi.weebly.com/uploads/1/3/2/7/132740410/13ffa9.pdfIn PDF document text
    • https://cdn.sqhk.co/xawodoze/dbrjcoz/29287349206.pdfIn PDF document text
    • http://idealicaitaly.site/free_eligibility_worker_exam_study_guide9vvrb.pdfIn PDF document text
    • http://tameeniraq.com/672553147999ad1k.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6c49ff76-e13b-46da-8354-2e633d56f736.filesusr.com/ugd/211c2d_620a745cf9a4413294c51411e811a6a3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b06daa6-6718-4b57-8d29-af4f19351577/65147774043.pdfIn PDF document text
    • https://601bead5-a720-4f65-98db-62fe2a42cb91.filesusr.com/ugd/0e52b4_b8f55b9f0a7442c285ec73ab9047f6b5.pdf?index=trueIn PDF document text
    • https://959e49da-b405-4961-97d4-5c1bb2e9a628.filesusr.com/ugd/ab0441_762a33e31ba04daa86a7981571322563.pdf?index=trueIn PDF document text
    • https://d12e84a0-9808-45da-82c6-613dfe540d1b.filesusr.com/ugd/dc8a8e_c3e185b9ec0a42bea7e401ae06af0757.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ab50873-b1b8-416c-8336-695966399be5/86982267052.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_off0000eeba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBA 5248 bytes
SHA-256: 6d8463f0916622f535e078407bbc731251ead8a761f1756cabe95d8c5efc9a42
font_01_sfnt_off00010097.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10097 1936 bytes
SHA-256: 7420db9ec41012b263dff8e0d039d2a895961a6b4c1647eabbcd20f441fad98a
font_02_sfnt_off000109de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109DE 10892 bytes
SHA-256: c213e299959fd83c38128debb9ac846761d5fe7ac98ab55c6ee868f792daf4c0