Malicious PDF — malware analysis report

Static analysis result for SHA-256 7574b11613e8ca3c…

MALICIOUS

PDF

72.5 KB Created: 2021-03-14 11:17:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: fb9123b19dbf2a5769ecb76cb5b8ba43 SHA-1: 25dcc3cb041bbd503b5a659ca42f6c785961b853 SHA-256: 7574b11613e8ca3cd6da65aa9a802f8d0909ea2d21dde8544b4113b7c25a7291
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing sites or potentially host further malicious content. The embedded URLs and the PDF structure point towards an attempt to manipulate search engine rankings or trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://fokemale.ru/strik?utm_term=wii+console+bundle+walmart PDF link annotation
    • https://nozoporunetub.weebly.com/uploads/1/3/0/8/130814805/dd0f33caff46472.pdfIn PDF document text
    • http://ionatr.fun/theory_of_justice_musicalec0xg.pdfIn PDF document text
    • http://todayshop.website/invisible_man_ellison_quotesfuo4i.pdfIn PDF document text
    • https://bejobaxugifupe.weebly.com/uploads/1/3/4/6/134628864/xilupuzobuxu_rorilori.pdfIn PDF document text
    • https://lurenosofen.weebly.com/uploads/1/3/0/7/130740325/dejisexuwilosusetisu.pdfIn PDF document text
    • https://vumifedesonuzik.weebly.com/uploads/1/3/4/8/134849268/5baac71d6605f9d.pdfIn PDF document text
    • http://kino-vezde.ru/gubasupul0hibd.pdfIn PDF document text
    • http://kizidotiz.iblogger.org/44634831475.pdfIn PDF document text
    • http://liko-sneakers.com/nicki_minaj_height_in_feetjat37.pdfIn PDF document text
    • https://lusefova.weebly.com/uploads/1/3/4/5/134583673/1ab93c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://memapekoge.epizy.com/jodef.pdfIn PDF document text
    • https://0a3c8164-ddd9-4522-8472-457ce31ece15.filesusr.com/ugd/d32f78_2d9b4b731ecb403c97f5e83f74319941.pdf?index=trueIn PDF document text
    • https://2c8134a4-d865-4da1-8961-c755d7242105.filesusr.com/ugd/6dcf04_51dbce4e59754f06924a9175c737618a.pdf?index=trueIn PDF document text
    • https://5fdaa9e0-ad6d-443b-8779-beb8e45026dc.filesusr.com/ugd/05301a_fbd9c31142fd4ec78ee25f63a4d82987.pdf?index=trueIn PDF document text
    • https://3568c1c9-c281-4b9a-9ea9-d5d291e0176b.filesusr.com/ugd/e5d8db_b27dcb2ef64f4a0da3863ba9e6ff4eee.pdf?index=trueIn PDF document text
    • http://nezarokex.epizy.com/41676570094.pdfIn PDF document text
    • https://8f1c0ae7-1ba6-4c51-a623-4d29f5e3aebb.filesusr.com/ugd/c1615c_fcaf5be195af4dc1b0d8fcf2ba40efbd.pdf?index=trueIn PDF document text
    • http://nezuwuxupewe.rf.gd/how_do_i_know_if_my_furnace_pressure_switch_is_bad.pdfIn PDF document text
    • https://ea7788ad-ef5a-48b5-911d-3ad522045378.filesusr.com/ugd/f3bfbb_8b88f223bb2c4b79810534cf1a19b0c8.pdf?index=trueIn PDF document text
    • https://fb7bf4c5-056f-4058-a7d1-073478569b53.filesusr.com/ugd/d90490_cf16b71ac3ba4eab8c810aa97d6fcf11.pdf?index=trueIn PDF document text
    • http://boraxatisota.rf.gd/guide_to_south_african_grasses.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_off0000de50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE50 5328 bytes
SHA-256: 9b72d61c2c5d0a1d4a7adef13b80df8a77364cf9fdaade1fbdce8058ec37bb13
font_01_sfnt_off0000f06d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06D 10872 bytes
SHA-256: 31c4ddc4d5cd38b814a32c30f03119c3d271b80f3421031fbc5cc65f0cbeec70