Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf5e871e54aa4b4e…

MALICIOUS

PDF

71.6 KB Created: 2021-03-31 22:39:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 0ebd9d332cb6d4015334b739d29107d3 SHA-1: c9e1952b9616620fdb94cfa5b532db61fc64ed2b SHA-256: bf5e871e54aa4b4ea57012af238655820028de68a4065bb43be3e06f6a701602
196 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a primary URL pointing to 'botokaw.ru'. This URL is presented as a quiz answer key, suggesting a phishing or credential harvesting lure. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, many of which are likely part of a link farm designed to improve search engine ranking for malicious content. ClamAV also detected this file as 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://botokaw.ru/wix?keyword=everfi+module+6+renting+vs+owning+final+quiz+answers PDF link annotation
    • https://kilosite.weebly.com/uploads/1/3/0/7/130739696/fikobinafet_sodijamobane_pebinop_tasuleporonoju.pdfIn PDF document text
    • https://tonuvufew.weebly.com/uploads/1/3/1/4/131438708/4a1fa5a34d78ae3.pdfIn PDF document text
    • https://cdn.sqhk.co/gosukutusu/FhbOjc7/fly_away_little_birdie_lyrics.pdfIn PDF document text
    • https://cdn.sqhk.co/xugiwatokax/ognhigj/36480844643.pdfIn PDF document text
    • http://usesoda.pro/wiguxenovuxar35uod.pdfIn PDF document text
    • http://rent-nout.site/kalikabary0evf.pdfIn PDF document text
    • https://jomufoxubibad.weebly.com/uploads/1/3/1/1/131164047/79f029.pdfIn PDF document text
    • https://cdn.sqhk.co/nutewakizi/iZidjim/69792281119.pdfIn PDF document text
    • https://limisakaxenit.weebly.com/uploads/1/3/4/3/134371081/patokiz.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/gifojuxaxeva/sejarah_terbentuknya_amerika_serikat.pdfIn PDF document text
    • https://s3.amazonaws.com/bitajemisajoz/is_nacl_in_h2o_acidic_basic_or_neutral.pdfIn PDF document text
    • https://s3.amazonaws.com/gozilum/3285112331.pdfIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/the_evil_within_boss_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/gabriel_s_oboe_for_clarinet_sheet_music.pdfIn PDF document text
    • https://0eb00d84-361a-45dc-b346-1af5c8eb785c.filesusr.com/ugd/d79848_de5f8cef7b704d71acfabd5c2fc839f4.pdf?index=trueIn PDF document text
    • https://30cc9e9c-6145-4029-bfdc-d0561bdb3a10.filesusr.com/ugd/0dcf4b_a7ddf1a6196146a7a3af6432c8a4bcc5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sazomo/conscious_capitalism_review.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_off0000d6b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6B1 5664 bytes
SHA-256: 896aa5d32a537848d29c6245d7d9bb4da2608611a6f88be87e78a2deb7c9dc98
font_01_sfnt_off0000e9f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F9 10816 bytes
SHA-256: f02876d8a6c8791ffe727f7206a60b80bc47df1187e5939f0aa47f5b7c2e0b89

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