Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dfc2311691f10dc…

MALICIOUS

PDF

84.7 KB Created: 2021-04-16 15:20:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 86bd273b0bcef6469379a6b19a894c48 SHA-1: 49b3fc877aae5b702c3eb3855ce5f5bed416a37a SHA-256: 5dfc2311691f10dcbeab58248f7caa0d3e25abb35aa2c0633093a915bbb2c6ce
186 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 hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the structure of the PDF point towards it being used to redirect users to potentially malicious websites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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.
  • 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://xezojetit.ru/strik?utm_term=timex+expedition+scout+chronograph+black PDF link annotation
    • http://mir23.xyz/ms_excel_interview_questions_and_answersx0qj4.pdfIn PDF document text
    • https://vunisanelebori.weebly.com/uploads/1/3/3/9/133999195/jewulatevane.pdfIn PDF document text
    • https://dizegixevovule.weebly.com/uploads/1/3/4/5/134576191/jerofarebazud_tatet_vubebet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375353/normal_5fcd3b7e5527d.pdfIn PDF document text
    • http://ketrovk.xyz/8655671478729yji.pdfIn PDF document text
    • https://pekedilude.weebly.com/uploads/1/3/4/3/134324883/5492160.pdfIn PDF document text
    • https://cdn.sqhk.co/wirowanorax/12iJiaj/tomerobomu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372702/normal_5feea987b0cae.pdfIn PDF document text
    • http://cocobeautybar.ca/63556629669uinm0.pdfIn PDF document text
    • https://cdn.sqhk.co/vutexexukus/dmjag3p/45716672897.pdfIn PDF document text
    • http://nebofimanigi.sportsontheweb.net/pizapuvupasezeviwe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420237/normal_6055269e48e77.pdfIn PDF document text
    • http://gojovujewinunuj.mygamesonline.org/85200453484.pdfIn PDF document text
    • http://help-bluebadgecenter.com/45690330298px8b9.pdfIn PDF document text
    • https://cdn.sqhk.co/fefamuve/jWYWOFW/childish_major_woosah.pdfIn PDF document text
    • https://kutekedutowake.weebly.com/uploads/1/3/4/6/134635623/5669189.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413118/normal_603f1590435c4.pdfIn PDF document text
    • https://cdn.sqhk.co/kulobibab/eN6sS2T/vikings_age_of_warlords_mod_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://18b62485-dce0-4e35-9712-b1d1f13fcb23.filesusr.com/ugd/296484_902cd87afb1c47899628ca9c879b2b34.pdf?index=trueIn PDF document text
    • https://28f2c00a-638b-45ec-8848-4d649cb6aba9.filesusr.com/ugd/946f28_448f52da59f14f6c9207dcc07ddcecff.pdf?index=trueIn PDF document text
    • http://zipulosi.atwebpages.com/nitiru.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f51c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51C 5708 bytes
SHA-256: cad2cd5ad2424d865491e750d5aec64dd76724eaa1dcf96db0e965ed0e66f0ac
font_01_sfnt_off00010857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10857 11532 bytes
SHA-256: bd9e76cd77bb945802bc2adb9da36a0b7e49a09627f87df19a414c14402ba0eb
font_02_sfnt_off00012fd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD8 16204 bytes
SHA-256: e93acd332f5893643511f4cefd38969ad5c744ad1b08842a788b6be7d277dd15