Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3a7d81ade3d68aa…

MALICIOUS

PDF

77.6 KB Created: 2021-02-28 13:49:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 2125d3a85c00ab24a1c836d45d7ace40 SHA-1: 95074542283943fdfa57886e46aacb4f968b2a3a SHA-256: e3a7d81ade3d68aa8bbdd4eaadbe1327191f6d451783d26c7bb164bfe43e4dcb
186 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics as a link farm, containing numerous external links to other PDFs hosted on disposable domains. The ML classifier and ClamAV also strongly indicated maliciousness. The document's primary function appears to be directing users to a network of linked content, likely for SEO manipulation or to host phishing lures.

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 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.
  • 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://jacksth.ru/award?keyword=carnage+meaning+in+tamil PDF link annotation
    • https://zukikopan.weebly.com/uploads/1/3/0/7/130775822/ropomedewuw.pdfIn PDF document text
    • https://rojanudase.weebly.com/uploads/1/3/0/9/130969060/9dc95ee0a1b2e.pdfIn PDF document text
    • https://cdn.sqhk.co/pijuvedozuw/XzejbwB/2048_original_game.pdfIn PDF document text
    • https://cdn.sqhk.co/wesaduleb/whdRXgc/stubhub_tickets_not_working.pdfIn PDF document text
    • https://suzixibaru.weebly.com/uploads/1/3/4/7/134709676/gewizin_zajanotagim_wifozenus_dokavoseveput.pdfIn PDF document text
    • https://lelopotive.weebly.com/uploads/1/3/0/7/130738546/tikujowogajuto.pdfIn PDF document text
    • https://cdn.sqhk.co/dojidavos/gHhdifr/vanibolunimadabuzaduz.pdfIn PDF document text
    • https://vafopizinenited.weebly.com/uploads/1/3/4/4/134480139/pufiradew-zifidaga-lafinami-pitosipuvurine.pdfIn PDF document text
    • https://cdn.sqhk.co/rujoremebi/Yif7wjc/suxagigilimimagipekujita.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/tobaziw/any_online_video_er_apk.pdfIn PDF document text
    • http://nosigegu.onlinewebshop.net/dijabofuwakak.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE5 4732 bytes
SHA-256: 8c3470fd386cf8d309406762dcda5fad497548c9f68c5b10e590a9a52f75344c
font_01_sfnt_off0000dedc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDC 4436 bytes
SHA-256: 5b238f1a822830e150590551c9142f378aa15a0f146331eb7693cb37d4bd7f12
font_02_sfnt_off0000ef1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1E 10140 bytes
SHA-256: 90d78c6911f15858170b503c5ca399abe527ab42b174ec2f414d20430b66f85e
font_03_sfnt_off000111c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C1 16228 bytes
SHA-256: d5d85e3aaaa5992967d3bcc314d74791cb71fca714f8331f5cf69889fcc7a56c

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