Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff6b385990dd9d9c…

MALICIOUS

PDF

71.9 KB Created: 2021-01-06 14:06:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 1368984ca3b148b464b8d9730d7ad37c SHA-1: ea4486e4ac143d8cafedc24a5671d2cc972159be SHA-256: ff6b385990dd9d9cced29a8c0ae1e30014f6c5c527e86c03e019d7aa0059b981
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicative of a link farm used for phishing or malware distribution. Heuristics like PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM, along with ClamAV detection as Pdf.Phishing.Trojan, strongly suggest malicious intent. The embedded URLs, such as 'https://trafffi.ru/aws?utm_term=twitter+app+for+mobile+phone', likely serve as entry points to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffi.ru/aws?utm_term=twitter+app+for+mobile+phone PDF link annotation
    • https://devudupaf.weebly.com/uploads/1/3/4/8/134880603/3492390.pdfIn PDF document text
    • https://vaxajiwozoli.weebly.com/uploads/1/3/1/6/131637631/rupomiro.pdfIn PDF document text
    • https://sodefabufu.weebly.com/uploads/1/3/4/4/134473286/6201306.pdfIn PDF document text
    • https://sidafixeruj.weebly.com/uploads/1/3/2/6/132681612/rimog.pdfIn PDF document text
    • https://cdn.sqhk.co/retepisej/7mH8him/54792013933.pdfIn PDF document text
    • https://fekazivijiwawad.weebly.com/uploads/1/3/4/6/134687088/267234.pdfIn PDF document text
    • https://rodawuliwunugen.weebly.com/uploads/1/3/4/4/134490897/lafozatis_nadilibekov_bavova_xasewimupof.pdfIn PDF document text
    • https://cdn.sqhk.co/fenajobuwer/iijNice/smith_s_hours_near_me.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8098a5b6-d6ab-445b-a7d6-ec6f8ecbb25e/guess_the_emoji_movies_level_5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7dc3fef7-e39c-404d-a87b-d911736e65a2/gedetojisukiwazopumo.pdfIn PDF document text
    • https://s3.amazonaws.com/piwupevivotixi/dazopexa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc443190-08c5-4c01-85bc-1b6915fa7d5a/10828032032.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce03ad1d-f852-4ec5-8a3f-1f5c8a85fda5/como_hacer_ventanas_de_madera_paso_a.pdfIn PDF document text
    • https://s3.amazonaws.com/farezelof/catabolismo_de_carbohidratos.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_off0000dc2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2F 5144 bytes
SHA-256: b66c32d44030dc526e54786aeea8234db196ae26567a8aae16a1457fcf880358
font_01_sfnt_off0000ed93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED93 11048 bytes
SHA-256: 39c1aac06aca94748aa14a012ea69a7bbe145eac76315f2ce204a659a79b048e

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