Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd93031508cc0f46…

MALICIOUS

PDF

72.6 KB Created: 2021-03-17 10:03:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 511bd10cae1f90d6698564e9377603df SHA-1: 48fc2ebccacb028e0bc4ffb561003bd8f6dfa60f SHA-256: dd93031508cc0f46952585f2785af5190d36acf1eb9621786c056953d4e8295b
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, suggesting it is part of a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristics point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://maypoin.ru/wix?keyword=generac+6500+parts+manual
    • https://nekusudowup.weebly.com/uploads/1/3/5/3/135315851/3712367.pdf
    • https://zosagejezigim.weebly.com/uploads/1/3/4/7/134709887/logosoretesom.pdf
    • https://badupulok.weebly.com/uploads/1/3/4/8/134855905/sarasunujeta-wokap-zijigujul-gejogazo.pdf
    • https://wemuxafav.weebly.com/uploads/1/3/4/8/134860001/4135748.pdf
    • https://xizevidunofi.weebly.com/uploads/1/3/4/3/134321119/dewenopes_vepik_xevijije_redununolalizib.pdf
    • https://jukonejidar.weebly.com/uploads/1/3/4/8/134876273/8702310.pdf
    • https://kalujobad.weebly.com/uploads/1/3/4/3/134390175/najimidijifo_fapafasimo.pdf
    • https://fakazurirogedim.weebly.com/uploads/1/3/4/7/134743668/1357372.pdf
    • https://dovezoluwebib.weebly.com/uploads/1/3/4/0/134017866/lidemeseme-xoxosesegeri-kenevojis-fuguji.pdf
    • https://mubujibazakob.weebly.com/uploads/1/3/3/9/133986275/wegixob_mubofip.pdf
    • https://zunejafeg.weebly.com/uploads/1/3/4/3/134382709/gotixovasejuvek-komatemo.pdf
    • https://nokajavu.weebly.com/uploads/1/3/0/9/130969653/8635093.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/timeziso/sap_crystal_reports_cost.pdf
    • https://75cc4b12-69da-4024-8422-75f9303faa99.filesusr.com/ugd/d6c222_1ed9d9d041d148febf62ba3ef259f501.pdf?index=true
    • https://50bf384a-eeac-4f26-a262-e2ba1a5e00ba.filesusr.com/ugd/17159d_97d3b581136742a8944588c56d9700b4.pdf?index=true
    • https://0c2a7d7b-be9d-4ef2-a94c-09ca905cc17d.filesusr.com/ugd/7d21c0_2959560c22744907a92c9426beafea57.pdf?index=true
    • https://s3.amazonaws.com/sinadi/49171921259.pdf
    • https://45f61934-b4a1-4335-a9e3-e142d9465b5b.filesusr.com/ugd/0dd040_5995d50d0345499bb86454c67bfeb295.pdf?index=true
    • https://e691ad07-92dc-45fa-af10-8929b4045ede.filesusr.com/ugd/87b9a8_743d67e3330547fe863d9924dd11b39e.pdf?index=true
    • https://a1c9bafd-2917-4c1b-b79c-a4b44a941470.filesusr.com/ugd/f0f215_2959240f7d494b5cb32dd2aa73a203a3.pdf?index=true
    • https://s3.amazonaws.com/peveziwoguxuzam/cbr_250_mc22_workshop_manual.pdf
    • https://d6236f05-450e-4b96-9875-1783d83c708b.filesusr.com/ugd/912de2_f2ac4ceb72294f5cb7cf5481f87229ac.pdf?index=true
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df43.bin
dd3ed00057ba8a06e6615a32937ea6cb7d9a7edc8182e738d0cdfd5a17112eb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF43 5532 bytes
font_01_sfnt_off0000f1f7.bin
5e0f487bf192941fe150189e6bdc3dacf8aee24bf9f6bb70207592d15ba986a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F7 10372 bytes

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