Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c526cdfab6004b1…

MALICIOUS

PDF

133.3 KB Created: 2021-03-25 13:39:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4677f2a2f180b3cf9488b35a3b674cab SHA-1: 118e97e9887afe162551fed351e1b0c6db9529df SHA-256: 9c526cdfab6004b1b8d3fe54041b0c54aa0a394052e4b8770b23347dbb964a42
126 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous external URIs, with one pointing to a link farm on disposable hosting, suggesting a phishing or redirection attempt. The presence of embedded URLs and the overall structure strongly suggest it's part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://golowaki.ru/wix?keyword=dua+for+traveling+in+english
    • https://cdn.sqhk.co/vukebomuwan/buidhjG/53614911874.pdf
    • https://cdn.sqhk.co/wodegamido/eYJjbhd/pudirali.pdf
    • http://afracheat3.xyz/9195350111xgahq.pdf
    • http://mukovasisoro.mygamesonline.org/98827169819.pdf
    • http://vumogegotawugub.mypressonline.com/red_bus_ticket_format.pdf
    • http://sivesesugipode.scienceontheweb.net/24800296581.pdf
    • http://my-favshop.online/tugugizoxidepixowefiju53d2z.pdf
    • http://difemetudanad.22web.org/anaesthesia_for_spine_surgery.pdf
    • http://gakawisogafuga.mygamesonline.org/calendario_sep_2020_al_2021.pdf
    • http://copyrightproblem.com/39449565574tw12u.pdf
    • http://dfwshootersupply.com/what_causes_a_2005_honda_civic_to_overheathav46.pdf
    • https://cdn.sqhk.co/tiwopaperuv/mhjBSCG/98922882935.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zagubip/14411450973.pdf
    • https://s3.amazonaws.com/tujeviwakirawu/royal_120dx_cash_register_paper.pdf
    • http://rinubokuj.rf.gd/professional_powerpoint_templates_ideas.pdf
    • https://s3.amazonaws.com/tinezedu/oneplus_7_android_10_update.pdf
    • http://jisizogazojebin.rf.gd/how_to_do_basic_crochet.pdf
    • http://soveralenox.epizy.com/are_neuro_sonic_drinks_good_for_you.pdf
    • http://sedunadilame.rf.gd/bldc_motor_book.pdf
    • http://xijejuvi.myartsonline.com/81880032862.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001cfff.bin
d2bdabd91e50d21c6649282bcbe445f3f2f27df39bd9c84b10f83a76578a0540		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1CFFF 31500 bytes
font_00_sfnt_off00019503.bin
84d1b90b5399546196d021b2d6ff9f29e8dfe8001628b773433c8b3d3d8a8b96		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19503 5088 bytes
font_01_sfnt_off0001a65d.bin
2edf1c37609e6adac23076cae4c517e7a3329aa560d0769ca2f3684c5fb86138		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A65D 12168 bytes

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