Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fd4903f9b1638ed…

MALICIOUS

PDF

127.1 KB Created: 2021-03-04 23:43:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 89e3adc670c00420f2878b4e482225b6 SHA-1: 967dbd1048e61da7c27183dcae11a37290a1f471 SHA-256: 7fd4903f9b1638edbb033b8b7f5ff98148e83c633a3f82803396688158cc829e
186 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous external URLs, many hosted on disposable domains, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely a phishing or trojan distribution attempt. Although no scripts were explicitly extracted, the presence of a link farm and external URIs points to a common technique for delivering second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://botokaw.ru/strik?utm_term=how+to+start+a+40+hp+johnson+outboard+motor PDF link annotation
    • https://dusitibepilezu.weebly.com/uploads/1/3/1/4/131437978/xasebivegefas.pdfIn PDF document text
    • http://freud.icu/the_attitude_change_model_assumesz84ok.pdfIn PDF document text
    • http://minesaxofunawi.getenjoyment.net/what_are_the_types_of_circuits_are_used_in_residential_wiring.pdfIn PDF document text
    • http://zerkalo-fugicar.website/513302817153xz8p.pdfIn PDF document text
    • https://dajepulexito.weebly.com/uploads/1/3/4/5/134591334/69eb9282bce.pdfIn PDF document text
    • http://bitcoinlearningcentre.online/snugride_30_lx_car_seat61xbl.pdfIn PDF document text
    • https://jumuwaxenu.weebly.com/uploads/1/3/1/4/131406560/xepurudokibuzinu.pdfIn PDF document text
    • http://jusojixanona.getenjoyment.net/96864074334.pdfIn PDF document text
    • http://itdiscount.pro/95195923621e09fm.pdfIn PDF document text
    • http://ruwosiju.getenjoyment.net/40197617465.pdfIn PDF document text
    • https://kofovozeregom.weebly.com/uploads/1/3/4/3/134313602/679edf.pdfIn PDF document text
    • https://wefigofotagovir.weebly.com/uploads/1/3/4/8/134864379/gofuv.pdfIn PDF document text
    • http://porn77.design/timex_triathlon_watch_manualjfbvq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bovenotojitowe/databenobowepibewutu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7383d89d-06c4-4f4a-a305-c5b6e5e06509/brother_p-touch_pt-90_label_maker_instructions.pdfIn PDF document text
    • https://30f21d72-2b41-4965-a7bc-2abb02bf1ded.filesusr.com/ugd/47e66e_d90c7a668c3d4f7db85320d973b713ff.pdf?index=trueIn PDF document text
    • https://167c8e7b-8160-49a2-a88e-f26749d647c8.filesusr.com/ugd/1ad47d_cc0dd7d812dc4724838ac6a919c28d85.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mafavuzenoliki/ikea_bureau_informatique_bois.pdfIn PDF document text
    • https://35548484-ce42-4b18-9d9d-834326683263.filesusr.com/ugd/a221b6_730a890e40494bde966f59942009bb31.pdf?index=trueIn PDF document text
    • https://20996a60-9695-4f45-8fdb-44bdc783da55.filesusr.com/ugd/c57cae_f5c69f691c504423bb022fe1ac24bce3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/71f95194-488b-404c-83a4-457fca4e95c6/how_to_operate_a_foodsaver_vacuum_sealer_v2244.pdfIn PDF document text
    • https://s3.amazonaws.com/nezanurugega/arabic_dance_music_video.pdfIn PDF document text
    • https://93dbb2ad-f1e8-4c6c-adfd-2ef134399473.filesusr.com/ugd/df4650_56f547a1725d4937a0244ff47d20b291.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pipaneku/fire_truck_bed_sheets_canada.pdfIn PDF document text
    • https://s3.amazonaws.com/fatikonavori/wimigoxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9d1fdc8-96e2-4070-ab32-f3719eda085f/dazidixufetapa.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B352 5668 bytes
SHA-256: 632b613f1ee6b76e116d7e22854657e50caa2a0f537fe884e0dbec59d14ab467
font_01_sfnt_off0001c677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C677 11940 bytes
SHA-256: 90143f3b9694240179bf6c1de2c10597a0110049e3a57fa02a2fbc8771f863da