Malicious PDF — malware analysis report

Static analysis result for SHA-256 52fb268e418f82c1…

MALICIOUS

PDF

168.9 KB Created: 2021-04-01 00:23:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 081441d7a11557ebf567592d04b5fea5 SHA-1: b6cedf8c9be81853d8eee83b2ec629d9daf6e214 SHA-256: 52fb268e418f82c178a9d6f10d4a6dc16199737eb87323c1446ed7287f666321
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

Heuristics 5

  • 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 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://fokemale.ru/123?utm_term=metabolisme+seluler+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4378386/normal_604301464f36e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415524/normal_5fe1b25f38be9.pdfIn PDF document text
    • https://bumopabir.weebly.com/uploads/1/3/4/6/134679094/9584050.pdfIn PDF document text
    • https://cdn.sqhk.co/kovajivika/gwieiea/cookie_clicker_hacked_game.pdfIn PDF document text
    • https://metozalolak.weebly.com/uploads/1/3/4/6/134610510/5303127.pdfIn PDF document text
    • https://cdn.sqhk.co/feguzuvubut/9ShaVie/biker_mice_from_mars_season_3_episode_1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476758/normal_600f86cc10a31.pdfIn PDF document text
    • https://cdn.sqhk.co/fugovigul/eJifhcn/kodiak_weather_underground.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495265/normal_5ff7822de447c.pdfIn PDF document text
    • https://disemorabegelam.weebly.com/uploads/1/3/1/3/131383982/vidozumin_wawugata_pakurelipevoxup_muxeworato.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482399/normal_602ae65b3c15d.pdfIn PDF document text
    • https://cdn.sqhk.co/pelopuxi/jgeNKhh/best_off_road_car_gta_5_offline.pdfIn PDF document text
    • https://malabukepi.weebly.com/uploads/1/3/0/9/130969546/dedakapafiva.pdfIn PDF document text
    • https://cdn.sqhk.co/nowonipewo/s5Ejiia/fly_game_for_cats.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381737/normal_5ffb1881a07a6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500438/normal_5fc7a91cb26a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479474/normal_60220b532a189.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500446/normal_6037d552e565f.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/gosete/do_dogs_ever_fall_into_a_deep_sleep.pdfIn PDF document text
    • http://jumepenitujox.atwebpages.com/tegada.pdfIn PDF document text
    • https://s3.amazonaws.com/lanubili/kilezexa.pdfIn PDF document text
    • https://s3.amazonaws.com/wuwabobujasivor/nidisejovixon.pdfIn PDF document text
    • http://bifovigavij.myartsonline.com/2018419830.pdfIn PDF document text
    • https://s3.amazonaws.com/bejenosugede/30867626376.pdfIn PDF document text
    • https://s3.amazonaws.com/wutogugej/pathfinder_kingmaker_wrath_of_the_righteous_mythic_paths.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_off0002553c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2553C 5332 bytes
SHA-256: 025b050c0ad6bd6422e0b4adfdf1e5bf20a1511cd2a112be6c3155a54ec58f86
font_01_sfnt_off00026748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26748 14668 bytes
SHA-256: c3948c8cdcb9b9016c706ba9a18dd40ee0b0977b7e83e8d2e5495530425d25b2