Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba4fc1c16b71a419…

MALICIOUS

PDF

74.0 KB Created: 2021-04-08 15:40:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0cf114a4f4d496f8a72e223a2688ba30 SHA-1: e505f4690fb478641e45bfd27a2e267e825c0da2 SHA-256: ba4fc1c16b71a419c121ec0a7c242aa63a6f40d985cd2d2abb3b72ea0c762fb5
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of malicious activity, likely related to spearphishing or SEO abuse to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • 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://jumiwimov.ru/strik?utm_term=portrait+photography+definition
    • https://nesurufaratetud.weebly.com/uploads/1/3/1/4/131408203/bupobupanif.pdf
    • http://ejinaya.com/nejukulefufixazaxyrvxo.pdf
    • https://xoludifatak.weebly.com/uploads/1/3/4/4/134477652/cd01fd.pdf
    • https://vinipuzi.weebly.com/uploads/1/3/0/7/130776781/6117668.pdf
    • http://natur-green.fun/the_sims_4_cheats_pc_needsgxcdz.pdf
    • http://j3vnci4.xyz/normal_delivery_baby_video_freekf6pk.pdf
    • http://i12tws.website/when_is_black_friday_for_walmart_2020fcp1h.pdf
    • https://xovuxajewilim.weebly.com/uploads/1/3/0/7/130775567/542658.pdf
    • https://lexabefi.weebly.com/uploads/1/3/1/3/131384613/887191.pdf
    • http://obmenkalnr.online/i_ready_answers_level_h_reading_quizxvgp8.pdf
    • https://notefusiwedamap.weebly.com/uploads/1/3/4/8/134872173/d1aa490b60da3dc.pdf
    • https://tavifarexup.weebly.com/uploads/1/3/4/6/134611028/gazuk.pdf
    • https://zewugijisisu.weebly.com/uploads/1/3/4/8/134885238/8014256.pdf
    • http://verifedform.com/suresh_shahasane_kp_astrology_bookavo66.pdf
    • http://selectgetc.top/roomba_770_side_brush_not_spinningxxzsg.pdf
    • https://lafevisok.weebly.com/uploads/1/3/2/6/132683062/9e14bdb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/eaae1bae-f9ab-4cc7-810f-89da86d2a6fd/role_of_teacher_in_organizing_co_curricular_activities.pdf
    • https://uploads.strikinglycdn.com/files/eba0f35e-1e98-488f-97c0-ad95f4eb2210/18569055404.pdf
    • https://uploads.strikinglycdn.com/files/3ac3bc5d-e6c0-42c3-a812-04adb4350649/what_is_the_formula_for_instantaneous_power.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_off0000e51f.bin
8c221b1b2a7d044b00dd164b7eb77c9a816330f6837d17e943e1d9f8c05f7c22		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE51F 5196 bytes
font_01_sfnt_off0000f6d1.bin
066e25f29d69d688833b9252bf1d2b0b7745b913d1a8e1f4926a1e37b3063729		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D1 10420 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.