Malicious PDF — malware analysis report

Static analysis result for SHA-256 a18462c1665204aa…

MALICIOUS

PDF

76.2 KB Created: 2021-03-21 10:22:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b82084d8a8ec50e849a1b5e8119d6095 SHA-1: 524ca07311ab1632f3fafb2caa6b32359233f012 SHA-256: a18462c1665204aa64da7e737560c7dd9884772f943d00332a70ff095b1fd55c
194 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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 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.
  • 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://jottigo.ru/123?utm_term=free++vidmate+older+version PDF link annotation
    • http://electorat.org/canada_visitor_visa_formalities56nv3.pdfIn PDF document text
    • https://cdn.sqhk.co/zaperarori/cv3jbGh/men_s_haircuts_with_long_beards.pdfIn PDF document text
    • https://cdn.sqhk.co/movijomo/jB1qjdg/all_creatures_great_and_small_vet_chambersburg_pa.pdfIn PDF document text
    • https://cdn.sqhk.co/lagidexetin/wPij8gc/67854185991.pdfIn PDF document text
    • https://cdn.sqhk.co/lelabepena/aN2ggie/nufawepufakifowir.pdfIn PDF document text
    • http://best-store.club/kymco_mxu_450i_service_manualrmw2b.pdfIn PDF document text
    • http://giveaway2020.info/how_to_connect_miroir_projector_to_iphonehl6jp.pdfIn PDF document text
    • https://dibasipelop.weebly.com/uploads/1/3/0/7/130738559/827e124.pdfIn PDF document text
    • http://craftsmansmetics.com/cadivi_catalogzpe7n.pdfIn PDF document text
    • http://devivitonewe.sportsontheweb.net/potumimupovireninuresotul.pdfIn PDF document text
    • https://cdn.sqhk.co/konidadelan/hcQDRHY/zokixeropijiko.pdfIn PDF document text
    • https://xevulesej.weebly.com/uploads/1/3/0/8/130874496/8681720.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9c43cb74-45e3-47de-9527-fda2e8336169.filesusr.com/ugd/af0aa9_643a0cc1421b4392baf4a2e6f620ca9b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jivagajamav/fudotufapufirudawinix.pdfIn PDF document text
    • https://s3.amazonaws.com/dozore/video_facebook_to_iphone.pdfIn PDF document text
    • https://9305c775-266c-4126-9ef9-90a5cffee957.filesusr.com/ugd/c3f88d_e145793a13b34d6fa952f6bed2cb521e.pdf?index=trueIn PDF document text
    • https://b70645e9-42d7-44c6-80f2-f165c8819e8d.filesusr.com/ugd/3f1130_39ba65f6be244115b6f4ba8f9de8b7b2.pdf?index=trueIn PDF document text
    • http://dovunufesesiz.onlinewebshop.net/54562013597.pdfIn PDF document text
    • https://2e21b658-2967-4279-8f18-a03590b678a5.filesusr.com/ugd/f5e1b2_bc7821cca6994ef1881000cae653bbe1.pdf?index=trueIn PDF document text
    • https://0b609444-e5a2-4a7e-9779-a3c6bae51a53.filesusr.com/ugd/529dbf_16da0cb152aa4edfbe7c9c5c8840f96b.pdf?index=trueIn 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_off0000ed83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED83 4984 bytes
SHA-256: a670e8b05c4f0ec9c9248ae94682af7f1b2c5796f3f158ce99abc1b4b424e0af
font_01_sfnt_off0000fe61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE61 10852 bytes
SHA-256: 7af16fdaf3e916ddd0f9736eedd4af745c8c2710e1a7eed55a4ba6359c786d21