Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ce4ad184914aaba…

MALICIOUS

PDF

82.8 KB Created: 2021-02-28 02:47:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: a479ff332132cfdcdadad35af49663d2 SHA-1: 60c7778f2a4224ccc99654e217813fd8d07b9cba SHA-256: 9ce4ad184914aaba03291064f04d7c7af130569a85e1be1c4f17110c7b9bc951
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs, many pointing to disposable hosting domains, and the document body suggests a lure for free software materials. Heuristics indicate it functions as a link farm and is flagged by ML classifiers and ClamAV as malicious phishing content. The presence of embedded JavaScript, though not directly executed in this static analysis, suggests potential for further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://botokaw.ru/123?utm_term=sketchup+vray+materials+free+download PDF link annotation
    • http://fafijitesulexiz.mygamesonline.org/78698500593.pdfIn PDF document text
    • http://mxbur.fun/binary_search_the_answerfcpba.pdfIn PDF document text
    • http://kuzexamipapoxip.medianewsonline.com/what_does_lsc_communications_stand_for.pdfIn PDF document text
    • http://megatorg.ru/58264895778ghwdo.pdfIn PDF document text
    • http://xufotegebiv.22web.org/dreambox_math_app_android.pdfIn PDF document text
    • http://oneitshop.info/bafinerevewt0e3k.pdfIn PDF document text
    • http://nejevefivi.mypressonline.com/45777341645.pdfIn PDF document text
    • http://bobiruropiles.22web.org/caaspp_practice_test_6th_grade.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/putelekireza/bluecoats_tilt_uniform.pdfIn PDF document text
    • https://s3.amazonaws.com/miwolezedubujoz/tazirakumiruzopupef.pdfIn PDF document text
    • http://vebusatoro.atwebpages.com/romo_fabrics_d_and_d_building.pdfIn PDF document text
    • http://fizenigapajawak.epizy.com/xolonodi.pdfIn PDF document text
    • http://geforagegi.atwebpages.com/how_to_calculate_the_net_income_after_tax.pdfIn PDF document text
    • http://wivifizurata.epizy.com/billboard_top_100_songs_2018_free.pdfIn PDF document text
    • http://sajomapujozokux.onlinewebshop.net/dumefa.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF782 5696 bytes
SHA-256: f97ea6014838a48444e5dda6bd1b7852a71fe0b4e619eea6e8760765c4364756
font_01_sfnt_off00010add.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADD 10792 bytes
SHA-256: f8f37d11158f229ac963eddde110abbb3c3952165c51d79eea5792efa93b91e6
font_02_sfnt_off00012fbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FBB 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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