Malicious PDF — malware analysis report

Static analysis result for SHA-256 3eaaa1315880d292…

MALICIOUS

PDF

85.3 KB Created: 2021-06-10 13:37:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 1ef7d66d024bffc0f9557aee9ba8f7e7 SHA-1: 1401ec7fc075348bf3b60808abd1eb2e9421d389 SHA-256: 3eaaa1315880d29229d058b91f08e46a18658181234db2e8fd0ee69b361cc8ce
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. It contains an embedded URL pointing to 'inwebjor.ru', which is likely used to redirect users to a phishing or malware distribution site. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a movie title, suggesting a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://inwebjor.ru/pbw?utm_term=dilwale+shahrukh+khan+ke+film PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4415046/normal_6023f0990c5c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403406/normal_60334991c26d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445749/normal_604b6f0fc97ea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489835/normal_5fce71b0e0bc4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505837/normal_6022411eac8c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412183/normal_5fd8dd156fd00.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413563/normal_5fd92a34a7220.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459916/normal_60173fd15d3c2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jutifakukap.pbworks.com/w/file/fetch/144497136/mafusirumu.pdfIn PDF document text
    • http://xuwuziz.pbworks.com/f/how_to_get_warpaint_and_rose_team_leader.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35e58d1f-cded-4816-a0a6-ae98b7649da8/82591329087.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c7c25a1-f36c-44d0-ba4a-514c771ae476/65577592460.pdfIn PDF document text
    • http://vadibun.pbworks.com/f/parts_of_blood_worksheet.pdfIn PDF document text
    • http://xulajirose.pbworks.com/f/happy_birthday_nisha_cake_pic.pdfIn PDF document text
    • http://pajuxuse.pbworks.com/w/file/fetch/144782145/wefikexutasi.pdfIn PDF document text
    • http://baxikufop.pbworks.com/f/89334603604.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1db26b0b-11ce-4ba9-ab85-a7fd8b7679fc/toddler_girl_clothes_boutique_near_me.pdfIn PDF document text
    • http://natizasex.pbworks.com/w/file/fetch/144724536/how_to_connect_receiver_to_speakers.pdfIn PDF document text
    • http://jedilukiwo.pbworks.com/f/kerixo.pdfIn PDF document text
    • http://risodige.pbworks.com/w/file/fetch/144713022/68962787514.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8f29ca5-c7d9-48ba-b453-ea7c32442a77/67044604520.pdfIn PDF document text
    • http://gupipax.pbworks.com/w/file/fetch/144899088/12129977062.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000deab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAB 6588 bytes
SHA-256: fa72874b8c381873b432d3b5cea9ecddba20f04e8e1c9face7d560df1136061a
font_01_sfnt_off0000ef25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF25 5160 bytes
SHA-256: 14e454547173e892655ddf5ceef253145b14921978c7f55585c63fbd09ea8dec
font_02_sfnt_off000100a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A0 12376 bytes
SHA-256: d348b61cf569d43610dc4f83f80d0641df7b4615739fe93f0446228c682e03b3
font_03_sfnt_off00012afc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AFC 17616 bytes
SHA-256: 4e285265de33999ae22d0ce21b08283f81bc0c1326dfe1d007e47d8667e26d18