Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1cbacd8614d8172…

MALICIOUS

PDF

70.0 KB Created: 2021-03-23 00:51:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4763734f31acb85dd7493c47173ffbde SHA-1: 799b3143ae6b8cba30fbc41421b0eae3019980d7 SHA-256: e1cbacd8614d817208220ad8820c6fd0ec31ae2bfdf74fda482dce45c1ee1352
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are to benign-looking but potentially malicious PDF files, suggesting a link farm or redirection scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards an attempt to redirect the user to malicious content.

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://dafemum.ru/strik?utm_term=toyota+corolla+2016+automatic+for+sale+in+lahore
    • https://bijazebis.weebly.com/uploads/1/3/1/3/131382141/79a223.pdf
    • http://zuzorovix.scienceontheweb.net/sidoruxat.pdf
    • http://gapagal.mywebcommunity.org/12065009793.pdf
    • http://bossyonlinex.com/jurawipijurutofewifijeg958b.pdf
    • https://zusonugen.weebly.com/uploads/1/3/5/3/135305237/pokoxojukufo.pdf
    • https://fetezubusob.weebly.com/uploads/1/3/2/6/132681625/zovofewipusike.pdf
    • http://bluetea.space/bowmasters_best_character_2020ke208.pdf
    • https://rapovadok.weebly.com/uploads/1/3/4/7/134705404/7729543.pdf
    • https://lawebigatu.weebly.com/uploads/1/3/1/4/131453175/2438422.pdf
    • https://kosipomorogimel.weebly.com/uploads/1/3/4/3/134307263/d5cffc.pdf
    • http://kuzexamipapoxip.medianewsonline.com/mupuzikikavamizumodip.pdf
    • http://tuwimig.scienceontheweb.net/55830136794.pdf
    • http://nebuxopav.mypressonline.com/what_is_step_4_in_aa.pdf
    • http://usacarins.com/matlab_software_free_download_for_windows_7_64_bit_with_crackmq1sl.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://liwumulexajuvi.epizy.com/good_character_reference_letter_format.pdf
    • https://836291d8-7b77-40db-be8c-3105928c7ef3.filesusr.com/ugd/aae074_16e618c9a43c477394a8cb4d45140e5a.pdf?index=true
    • https://9df6fdd8-df71-43fb-87ad-b121b2de7416.filesusr.com/ugd/e0d0cf_f965d1284cfb4292ba9c829b78dbea7c.pdf?index=true
    • https://ab2ac9d4-4772-4872-829d-c19fde0a4f90.filesusr.com/ugd/b919b3_b373ec3a641844acaa4ad9082623aab5.pdf?index=true
    • http://pipumatatipubu.rf.gd/12683557043.pdf
    • https://a8fdb364-3865-4521-a36b-e12f4de7752f.filesusr.com/ugd/e20637_f9f5ea9af31a4579808cfc467a520c6e.pdf?index=true
    • http://lofetumavigasi.epizy.com/cant_set_up_fitbit_versa_lite.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d46a.bin
937bebd9a499293ac0ab13d6fd522e3e666d3f056f76d72f4ebfb6f11bbc9307		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD46A 5652 bytes
font_01_sfnt_off0000e787.bin
58d956504acf3129724c340a7b5ff36105836de3bbefe5c0fad4947abf8fd95e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE787 10288 bytes

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