Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac07484ffc38458c…

MALICIOUS

PDF

76.3 KB Created: 2021-03-27 16:44:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd54a00fa5f9169964edf2b28c353e1e SHA-1: d299657d9564a7123817830a29b5f963a7b7a3a7 SHA-256: ac07484ffc38458c136af1c9697cd170b89e9502fd412a9080f908cc98d9ca2b
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL pointing to 'jacksth.ru', suggesting a link farm or phishing attempt. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The presence of embedded URLs and the overall structure indicate an attempt to redirect users to potentially harmful content.

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-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://jacksth.ru/strik?utm_term=how+to+write+an+essay+introduction+body+conclusion
    • http://erkutungotu.com/pg_date_sheet_2019_du_solsk9u0.pdf
    • https://pamaxorakumi.weebly.com/uploads/1/3/4/0/134019068/e8cef8c31506.pdf
    • https://fizinizaboz.weebly.com/uploads/1/3/5/3/135304720/a0ce6322.pdf
    • https://dogenirifalalu.weebly.com/uploads/1/3/0/7/130775866/bifebawev.pdf
    • https://xezelugewopisaw.weebly.com/uploads/1/3/5/3/135311865/fd4d3aa931f96.pdf
    • https://ladufuvugekowek.weebly.com/uploads/1/3/4/1/134108614/1899247.pdf
    • http://propovar.ru/nokoduxugalok1m41b.pdf
    • http://freedate18.xyz/824450253354tzhy.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/5a05c789-57a3-48a8-a201-55ec5465353f/joreda.pdf
    • https://s3.amazonaws.com/tifuwuw/zidumigutagedotifezutugoj.pdf
    • https://uploads.strikinglycdn.com/files/588223c5-3884-402b-8e1d-908e31576882/cant_open_wd_my_passport_on_mac.pdf
    • https://uploads.strikinglycdn.com/files/74697170-f668-4b8f-a624-e46f46f64313/can_i_exercise_if_i_have_scoliosis.pdf
    • https://s3.amazonaws.com/xupizewuxere/30865248372.pdf
    • https://d5e9a058-cbdc-4968-ba72-30cdbf1e36a3.filesusr.com/ugd/9cfd0a_e72c652f13d14f249c3e6cef067925b3.pdf?index=true
    • https://uploads.strikinglycdn.com/files/fc4847df-e244-4d20-a84b-d3de934a4748/how_to_measure_olive_oil_when_cooking.pdf
    • https://s3.amazonaws.com/zibenoroduzuw/wuwukixogenisezugadar.pdf
    • https://uploads.strikinglycdn.com/files/310c0937-3bdc-47cb-850a-f28d33d17c7c/convertidor_de_gramos_a_tazas_de_azucar.pdf
    • https://uploads.strikinglycdn.com/files/f8f50c4a-da06-4b3b-a189-1aa31d215caa/gejabefako.pdf
    • https://7648721b-06f4-4917-9c2a-921156fbbd07.filesusr.com/ugd/a7266c_78a0993211db42dc8e2b1ee9eca66c47.pdf?index=true
    • https://s3.amazonaws.com/sizabo/negative_binomial_mixed_effects_models_in_r.pdf
    • https://uploads.strikinglycdn.com/files/48790c79-5223-4143-aa26-100197afee6b/he_is_the_great_i_am_lyrics_gmwa_mass_choir.pdf
    • https://8d6920c1-aef5-45ed-b1a0-e693d63948fb.filesusr.com/ugd/0a593f_695a85124aaf4cd5b54d9da5f0d5d97d.pdf?index=true
    • https://87b84290-c0b3-4c73-97a1-3d59c64c3f69.filesusr.com/ugd/c638b7_0bf9821e7d7b4f5ab4be31fe43dc250d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/793a3a4f-0d72-4cfc-ba81-8a31db2a282a/semeb.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_off0000eda6.bin
46a43fe0fc3a6fa01f3805b6aac664ae66d5626d291fdc0a211480e59f962d5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA6 5228 bytes
font_01_sfnt_off0000ff8b.bin
c20622420404f14c4057b7dd9739fd539310774618e38b90e58a1cb00722e3bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8B 9984 bytes

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