Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6f123bf414e28af…

MALICIOUS

PDF

77.4 KB Created: 2021-03-24 00:47:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: dc75b102171d5854b898248d6e704451 SHA-1: b64c82cb137fc0d40785141cf59008ff8a2d752f SHA-256: a6f123bf414e28af9ba6fa0b652405bedd05d145837c51e6a604a70d0f3b18a7
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm designed to appear as legitimate search results for 'bulletproof diet book pdf free'. The primary URL, https://xezojetit.ru/award?keyword=bulletproof+diet+book+pdf+free, is identified as a redirector for free-download phishing. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to exploit SEO tactics for phishing, likely leading users to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://xezojetit.ru/award?keyword=bulletproof+diet+book+pdf+free PDF link annotation
    • https://cdn.sqhk.co/jaxubefe/yjipm2I/wrestle_amazing_2.pdfIn PDF document text
    • https://soletobapikod.weebly.com/uploads/1/3/4/5/134582957/nudamakejimefogikira.pdfIn PDF document text
    • http://geleostone.online/47085019712bkht9.pdfIn PDF document text
    • http://unreguezff.rest/37244420083cdnjc.pdfIn PDF document text
    • https://pikotawikeju.weebly.com/uploads/1/3/4/4/134496208/bcfed72dff246.pdfIn PDF document text
    • https://cdn.sqhk.co/ranotigu/crH8Tge/sonnys_menu_belle_vernon.pdfIn PDF document text
    • http://geosen.net/78288492254kww0h.pdfIn PDF document text
    • https://tatisosef.weebly.com/uploads/1/3/5/3/135333589/8915c9c16f1c.pdfIn PDF document text
    • https://cdn.sqhk.co/fumamimed/t3ggfmc/21539290294.pdfIn PDF document text
    • https://cdn.sqhk.co/xutazazo/gkWPNPV/bewulojudutab.pdfIn PDF document text
    • https://kilutiwoxit.weebly.com/uploads/1/3/1/6/131636983/kiroxoponad-bokasovexukijo.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/tesotiwapax/2018_calendar_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/muvazi/dantes_inferno_2010_trailer.pdfIn PDF document text
    • https://s3.amazonaws.com/firudegix/naletalajopi.pdfIn PDF document text
    • https://80b1f93a-fe74-4439-a81d-34814fa7a505.filesusr.com/ugd/e56fe2_6c7d8b402eef4bffb4f2a395751bfdbb.pdf?index=trueIn PDF document text
    • https://12a3aa02-022d-4218-8efb-90aa4388683d.filesusr.com/ugd/6dfd9b_929a143bdabf43fe919e861e1b28aa78.pdf?index=trueIn PDF document text
    • https://777dd155-384c-4f1d-a337-8f27b94bb056.filesusr.com/ugd/1ecdae_3e3bde1b51474e818eb85493ee1e23e2.pdf?index=trueIn PDF document text
    • https://92e0cadd-ca3c-497d-ba7d-1aece6ee6da0.filesusr.com/ugd/008e52_16b78fc087954512ad3350e17171aa0c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tonemakopinibem/impulse_control_disorder_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/godewumazek/phantom_doctrine_guide.pdfIn PDF document text
    • https://3c1efe6f-6e34-41bb-a2c4-2be85dd3cb33.filesusr.com/ugd/41f880_0dffbdcd729041c69fa205cc48d8bb14.pdf?index=trueIn PDF document text
    • https://cd5075e9-4951-46bd-8d13-413fdd501c9b.filesusr.com/ugd/eceaf1_38ff1d0bce5d46338e467f76c685bace.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_off0000f14a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14A 4900 bytes
SHA-256: 5e05d200e5d4d043ee3197b0a94a36660146c8a827207a44a4b56c9e6bfa9ab7
font_01_sfnt_off00010203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10203 10820 bytes
SHA-256: d5c8ba2b98a5c3db1c51323b97e0876c218f84d35f18eaa1f7a2c88718ce48eb