Malicious PDF — malware analysis report

Static analysis result for SHA-256 a487ca7d375c6bd4…

MALICIOUS

PDF

72.4 KB Created: 2021-02-15 15:25:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 98bc163120530c3920c3c50c76aaa8ec SHA-1: 8d186412765eb78570c5ce4bdc84d6e61308cb96 SHA-256: a487ca7d375c6bd4529e4de96c679ee0df4c03bee85d77c5edd6aacef857b1cc
186 Risk Score

Malware Insights

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

The PDF contains numerous links to external PDF files hosted on disposable domains, indicative of a link farm or phishing campaign. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification strongly suggests malicious intent. The document body, though obfuscated, appears to be a lure related to software downloads, likely intended to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/strik?utm_term=jupyter+notebook+free+download+for+windows+8.1 PDF link annotation
    • https://cdn.sqhk.co/sokavuwoz/fadiejj/dragon_island_race_game.pdfIn PDF document text
    • http://creamwalls.space/mewatamaleduwo2orwh.pdfIn PDF document text
    • http://reactivaperu-viabcpi.com/rovemuzikutusexepatfm80.pdfIn PDF document text
    • http://copriyghtconfirmed.com/caanz_financial_reporting_handbook_2019q6wt5.pdfIn PDF document text
    • https://gebijodefilamoz.weebly.com/uploads/1/3/1/4/131406109/betuseliboz.pdfIn PDF document text
    • https://jonukejunuxesa.weebly.com/uploads/1/3/1/4/131409236/kufezinol.pdfIn PDF document text
    • https://vipapesad.weebly.com/uploads/1/3/4/3/134369303/4867229.pdfIn PDF document text
    • https://cdn.sqhk.co/muxigatatini/aVJjaib/8094292577.pdfIn PDF document text
    • https://nefirekemoziwep.weebly.com/uploads/1/3/4/3/134332842/safitibunumegome.pdfIn PDF document text
    • https://cdn.sqhk.co/buxifuludo/bghjeij/54805533656.pdfIn PDF document text
    • https://torurukiruxo.weebly.com/uploads/1/3/4/5/134529807/jazogewopid.pdfIn PDF document text
    • https://cdn.sqhk.co/xovatagemi/hhdjct4/vidofimitatanevuxevobifu.pdfIn PDF document text
    • https://cdn.sqhk.co/zuronenom/gejcpid/45040096259.pdfIn PDF document text
    • http://swiss-gear.store/75263835171mps2m.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xogonat.epizy.com/meaning_dotted_line_reporting.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_off0000dd4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4D 5700 bytes
SHA-256: 4961868afbe837c5150b6664e64c5d090796bb694d683af5c065d9b77ca34a58
font_01_sfnt_off0000f0df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DF 10564 bytes
SHA-256: f04a6958e1f54a04ea86771bb549c271493125f5f877db8bc55baaff06256138

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