Malicious PDF — malware analysis report

Static analysis result for SHA-256 2277b6c2584fbfe5…

MALICIOUS

PDF

71.8 KB Created: 2021-02-19 02:45:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: efe287113ecb8c20d9d29d9d326bb987 SHA-1: 7e5ec84d4622da820e73f7f436910389620f83a3 SHA-256: 2277b6c2584fbfe5b9522d9217467eb9ce33ed64deb79911f07ba3261c119135
186 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ClamAV and an ML classifier as malicious. It contains a significant number of external links, with heuristics indicating a link farm hosted on disposable domains. This suggests the PDF is designed to lure users to external sites, likely for phishing or to download further malicious content.

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.
  • 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://baarspo.ru/wix?keyword=osrs+brutal+blue+dragon+slayer+guide PDF link annotation
    • http://agent-ritual495.online/que_es_artesanal_wikipediajmifk.pdfIn PDF document text
    • https://cdn.sqhk.co/wesegagage/jjjcPjf/emoji_keyboard_cute_emoticons_gif_stickers_apkpure.pdfIn PDF document text
    • http://moreprodukti.com/unlock_chegg_answers_for_free2dlvc.pdfIn PDF document text
    • http://kigurumi.org/abhimaan_full_movie_720p01snu.pdfIn PDF document text
    • http://momsmall.space/446183462196jpph.pdfIn PDF document text
    • https://cdn.sqhk.co/posojuvapono/yjfjgN2/71365680335.pdfIn PDF document text
    • https://cdn.sqhk.co/fudimesa/0oAsjbP/hit_the_roof_means_idioms.pdfIn PDF document text
    • https://gobunelesivuwol.weebly.com/uploads/1/3/2/3/132303092/sigidane_lovaro_padamipufotog_durujoxepizel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408340/normal_600c54c3a1910.pdfIn PDF document text
    • http://sandiego-podcasts.com/12053863902xo07y.pdfIn PDF document text
    • http://money-team.site/color_switch_on_scratchhl004.pdfIn PDF document text
    • https://cdn.sqhk.co/vabolepibe/qEibia8/98797525817.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489835/normal_5fe88a477301b.pdfIn PDF document text
    • https://cdn.sqhk.co/teketerep/jiwih6E/68376238787.pdfIn PDF document text
    • https://cdn.sqhk.co/dewozoju/PC8ERhj/jolenigofilojizuzajoseno.pdfIn PDF document text
    • https://cdn.sqhk.co/moromasi/iejgha7/dog_ear_infection_contagious_to_humans.pdfIn PDF document text
    • http://igcopyrightverify.com/lucent_synonyms_and_antonyms_book_downloado8vy3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000dbd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD8 5264 bytes
SHA-256: 835b6d7bfee05a46cd3903421dec0519bf525d9698818af27de27fb732d4afd9
font_01_sfnt_off0000edc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC7 10680 bytes
SHA-256: 8116569f47af8651a31dcc7acbfb6eb80dc713a6ed515e6402c2e38b3c7c6335

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