Malicious PDF — malware analysis report

Static analysis result for SHA-256 f866f29b41991998…

MALICIOUS

PDF

82.4 KB Created: 2021-05-26 06:51:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e959a3deaf230f53b06c983a2a067222 SHA-1: d434d62e0a9c8d5c1427007a8fb6cccac51ded27 SHA-256: f866f29b419919985521a304d219f976755b32abf28e09fd11b2dd4ea83a4310
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. One of the primary external URIs, 'https://vilenefex.ru/strik?utm_term=what+does+the+ending+of+akira+mean', is suspicious and likely leads to a phishing or malware distribution site. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/strik?utm_term=what+does+the+ending+of+akira+mean
    • https://static.s123-cdn-static.com/uploads/4465704/normal_5fe00fcb01f0c.pdf
    • https://dezijetide.weebly.com/uploads/1/3/4/8/134864221/jiwakurinef_redanisaxe_gitonuzosufin_xapinov.pdf
    • https://cdn-cms.f-static.net/uploads/4376610/normal_600ecd60c814f.pdf
    • https://wubudebekezame.weebly.com/uploads/1/3/0/7/130740051/tamorubotefe_ravexovewisewov_rijalekokazewik.pdf
    • https://bemujegifa.weebly.com/uploads/1/3/5/3/135312506/wakominegolan.pdf
    • https://static.s123-cdn-static.com/uploads/4490736/normal_600732d39bf80.pdf
    • https://poxokisajape.weebly.com/uploads/1/3/4/5/134592502/menuvofixizeloxu.pdf
    • https://cdn-cms.f-static.net/uploads/4376602/normal_60303ca0579cd.pdf
    • https://mosodujisar.weebly.com/uploads/1/3/0/7/130739504/3ba05.pdf
    • https://static.s123-cdn-static.com/uploads/4419650/normal_5ff9f998e1196.pdf
    • https://static.s123-cdn-static.com/uploads/4414352/normal_60013c95c4b85.pdf
    • https://static.s123-cdn-static.com/uploads/4406775/normal_5fcbb14100328.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/figidireki/lubewukavavolavogezubo.pdf
    • https://s3.amazonaws.com/batoragubukepo/euro_pro_toaster_oven.pdf
    • https://s3.amazonaws.com/wakuzidi/how_to_use_exercise_bands_for_abs.pdf
    • https://s3.amazonaws.com/zosevid/what_test_strips_work_with_accu_chek_nano.pdf
    • https://s3.amazonaws.com/bulujono/jodil.pdf
    • https://s3.amazonaws.com/rutufokedizon/checklist_formatting_slack.pdf
    • https://s3.amazonaws.com/podawakumepewez/driver_asus_x441ub_windows_10.pdf
    • https://s3.amazonaws.com/firigugixujotov/38837737679.pdf
    • https://s3.amazonaws.com/benubapopikaj/11159730258.pdf
    • https://s3.amazonaws.com/murudute/jejusumuruzizubevol.pdf
    • https://s3.amazonaws.com/dumupa/sequence_text_structure_worksheet_3rd_grade.pdf
    • https://s3.amazonaws.com/vufupu/exercise_34_frog_cardiovascular_physiology.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_off0000f861.bin
fcc926709be2a86915d52c270a1a311434c9b10d8505ab4bb73518cfe559e875
pdf-font-stream PDF embedded font (sfnt) at offset 0xF861 3880 bytes
font_01_sfnt_off00010612.bin
6dd3e49e8c5c38e4e290b577a98fd05bbb7ab9e57159c6d3c54815eeadaa2fd4
pdf-font-stream PDF embedded font (sfnt) at offset 0x10612 5364 bytes
font_02_sfnt_off00011836.bin
6cc13e955e3e52f338082aadcec6abfc658f40dae9568374026f5782fa502758
pdf-font-stream PDF embedded font (sfnt) at offset 0x11836 10376 bytes