Malicious PDF — malware analysis report

Static analysis result for SHA-256 90c68ba300e05003…

MALICIOUS

PDF

81.8 KB Created: 2021-04-05 09:20:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a577759986f470bbcb3c17395ae88f95 SHA-1: 2fad409cbd6d5052bd2c3d3de96fdc9044a25fcd SHA-256: 90c68ba300e0500345cf63df9f319ff26c48dc45cac38fc43ac8e52b3513a334
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection to malicious sites. The ClamAV detection and ML classifier further indicate malicious intent. While no scripts were explicitly extracted, the nature of the PDF and its numerous external links strongly suggest it is designed to redirect users to potentially harmful content, likely as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/strik?utm_term=what+does+incapacitation+mean+in+criminal+justice
    • http://towudunef.22web.org/roland_td_11_windows_driver.pdf
    • https://tezilejesitox.weebly.com/uploads/1/3/1/1/131163634/tusakijetu_daminibovuxufev_nekekuw_jonofif.pdf
    • https://juxusuvib.weebly.com/uploads/1/3/0/7/130739690/ditulosubirojisase.pdf
    • https://malinozibide.weebly.com/uploads/1/3/4/3/134380659/6114618ae9dda10.pdf
    • http://nokexukuzifuv.22web.org/27523074818.pdf
    • https://wugeneziwepuzi.weebly.com/uploads/1/3/4/4/134494794/sonokumagavagek_zalagogapa.pdf
    • http://davupopebuwiser.sportsontheweb.net/28527834573.pdf
    • https://sirutobij.weebly.com/uploads/1/3/0/7/130776617/diwubofurufukaber.pdf
    • http://dusibarupuguli.medianewsonline.com/autonics_at8n.pdf
    • https://jifilebipik.weebly.com/uploads/1/3/4/3/134375607/jutobukadapa.pdf
    • https://piroveda.weebly.com/uploads/1/3/2/7/132740505/2679364.pdf
    • https://lamuwopinu.weebly.com/uploads/1/3/4/6/134632291/d339827017d33.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/pulujolatepuv/19031935524.pdf
    • https://s3.amazonaws.com/wozowuledij/bhavani_ips_full_movie.pdf
    • http://gebozobab.epizy.com/restaurar_backup_whatsapp_android_en_iphone.pdf
    • https://s3.amazonaws.com/wizomoravazub/asa_kasa_devacha_dev_langda_video.pdf
    • https://s3.amazonaws.com/bopuxosavubare/kenubiz.pdf
    • https://s3.amazonaws.com/patilawasu/zotej.pdf
    • https://s3.amazonaws.com/gezizefefififa/juvosuvaxukugu.pdf
    • https://s3.amazonaws.com/jodabiladezot/bigasoft_video_er_pro_apk.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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f254.bin
c0803f525c6c62806238602e2989b3fa194b7e360d625c00334c8ca7af512feb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF254 5284 bytes
font_01_sfnt_off00010425.bin
6581abd1a340d0401c986c516b59f4d087a9b0da81bbfe8e105db8c878bc01dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10425 11536 bytes
font_02_sfnt_off00012b60.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B60 4324 bytes

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