Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5644ef3173568c7…

MALICIOUS

PDF

79.0 KB Created: 2021-03-06 10:43:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c28df96d8125db3132ffaed611ab2ed4 SHA-1: c89f0485073f82734bc24d574f11c7ac35efb452 SHA-256: e5644ef3173568c71f81926f77317976ecdd929902cf38e4422a3633afea476a
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 0.9996

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/strik?utm_term=how+to+exercise+with+resistance+tube PDF link annotation
    • http://zupeset.22web.org/33714207147.pdfIn PDF document text
    • http://nugekurobeju.iblogger.org/16792957401.pdfIn PDF document text
    • https://cdn.sqhk.co/tononapiwaso/jcPPPUj/ponabedededadenaloz.pdfIn PDF document text
    • http://afracheat3.xyz/harmonica_sheet_music_for_piano_manivfdm.pdfIn PDF document text
    • https://cdn.sqhk.co/kawonidoza/ghogiji/sapubasatelalixaxifokopos.pdfIn PDF document text
    • http://serviceforyou.site/medenitero1r7c.pdfIn PDF document text
    • https://cdn.sqhk.co/pabefidinaz/jeEIhaX/soccer_stars_game_hack.pdfIn PDF document text
    • https://cdn.sqhk.co/fivuwunar/L8pmUjf/the_dreams_vr_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/xaderipamuva/9FGifMc/guns_n_roses_soundboard.pdfIn PDF document text
    • https://cdn.sqhk.co/savunowudob/dyjepyf/my_little_pony_phone_wallpaper.pdfIn PDF document text
    • https://cdn.sqhk.co/miwavilusaji/RIhfhaS/2255851383.pdfIn PDF document text
    • https://cdn.sqhk.co/buwowunuras/fox6sjc/word_for_bluffing_in_spanish.pdfIn PDF document text
    • https://cdn.sqhk.co/nufopusifa/cORmlaa/xawuxopap.pdfIn PDF document text
    • https://cdn.sqhk.co/juwafajem/ji2Andk/jimmy_john_s_sandwiches_smaller.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/lupebesu/botanical_names_of_plants.pdfIn PDF document text
    • https://s3.amazonaws.com/sogovekevi/wuvonitagojaje.pdfIn PDF document text
    • https://s3.amazonaws.com/pevarijidasalop/poxibesamarekoropadu.pdfIn PDF document text
    • http://poresiz.epizy.com/ben_10_game_creator.pdfIn PDF document text
    • http://wereguvepowu.epizy.com/difference_between_android_version_7_and_8.pdfIn PDF document text
    • http://sibovalawusene.rf.gd/humayun_ahmed_movie_amar_ache_jol.pdfIn PDF document text
    • https://s3.amazonaws.com/lemefofutomapox/kowago.pdfIn PDF document text
    • https://s3.amazonaws.com/jedadokuti/92677691175.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_off0000f8f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F6 5116 bytes
SHA-256: 441f44532f9e9b7441f063a61be32f68741e7763bcdc814a53763a497169ce90
font_01_sfnt_off00010a6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6B 10496 bytes
SHA-256: f7e45c0ff0722a1f232ea88c423283bb4b85fa76b485125d9350487978973634

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