Malicious PDF — malware analysis report

Static analysis result for SHA-256 61c5af164a4b7aa5…

MALICIOUS

PDF

70.7 KB Created: 2021-02-10 20:45:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 8fba4a94e366e1d03992893eed6309df SHA-1: 7cd379cc8946106fc9c7697a9f9dcf8559a16f40 SHA-256: 61c5af164a4b7aa55445523051a8c3dc7a9b18e6da98a00a4debf160d1444e2a
126 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 embedded URLs, with at least one pointing to a disposable hosting service and another using UTM parameters, suggesting a phishing or malware distribution campaign. The PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

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://leonvi.ru/123?utm_term=a+heating+curve+worksheet+answers+chapter+11 PDF link annotation
    • https://cdn.sqhk.co/tepikipo/hciihiD/relaxezazobutowejasiwe.pdfIn PDF document text
    • https://nolaxefipox.weebly.com/uploads/1/3/4/7/134740184/8051105.pdfIn PDF document text
    • http://dodunagosukew.iblogger.org/40856382526.pdfIn PDF document text
    • https://karifizamazo.weebly.com/uploads/1/3/1/3/131383674/zovinexini.pdfIn PDF document text
    • https://bonuxomudod.weebly.com/uploads/1/3/2/8/132814593/328a4e33b5f.pdfIn PDF document text
    • https://puluzoxaxidu.weebly.com/uploads/1/3/2/6/132683087/kimobe_weximalalip_funijebu.pdfIn PDF document text
    • http://flymoney.net/veguriwdbeqk.pdfIn PDF document text
    • https://cdn.sqhk.co/wareberefiz/gd7xhcZ/asana_application_mac.pdfIn PDF document text
    • http://dejenenipanoz.22web.org/67297045370.pdfIn PDF document text
    • http://naturka.space/vegetarian_warak_enab_recipeair0w.pdfIn PDF document text
    • http://nakrutkavk.site/verasepusiravawukimikiudzq7.pdfIn PDF document text
    • https://texifafotolatip.weebly.com/uploads/1/3/4/7/134764930/zubagepalu.pdfIn PDF document text
    • http://sewasapeko.22web.org/avernum_escape_from_the_pit_guide.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/95602812910.pdfIn PDF document text
    • http://vejesigivilowen.rf.gd/tasikerag.pdfIn PDF document text
    • https://s3.amazonaws.com/xurixado/93207196522.pdfIn PDF document text
    • https://s3.amazonaws.com/dibedamoka/alchemist_android_game_guide.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_off0000d65c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD65C 5420 bytes
SHA-256: 938823df2c283e350deb94f76c25e93e601856102dcfc9f20860a10e0f927a42
font_01_sfnt_off0000e8e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E6 10684 bytes
SHA-256: da940e35bd87d642b94f27ad5b87f0b7c20e7846e3acc9431293f8557314b95d

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