Malicious PDF — malware analysis report

Static analysis result for SHA-256 bffbcffe7b583799…

MALICIOUS

PDF

72.2 KB Created: 2021-03-18 22:03:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 263d158d6b6eb7dcd216a7c8ca664397 SHA-1: 201811265492c83f9dd06b1ba10d9bbb5c6230b8 SHA-256: bffbcffe7b583799518fc2ed758d38bff50ba0f38773af4605fd2553b80a55fd
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.007 JavaScript

This PDF document contains a large number of external links, many of which point to disposable hosting services and are designed to lure users into downloading remote support tools. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the document's structure and embedded URLs suggest it's part of a link farm designed to distribute malicious payloads or facilitate social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://lozipotod.ru/award?keyword=srimad+bhagavatam+canto+10+part+3+pdf PDF link annotation
    • https://cdn.sqhk.co/levowexesu/6yiavGv/teamviewer_quicksupport_android_no_remote_control.pdfIn PDF document text
    • https://cdn.sqhk.co/tinodifozeza/ajbieyg/smart_car_weight_limit.pdfIn PDF document text
    • https://cdn.sqhk.co/jevamivuvugi/WqXjegh/68252869926.pdfIn PDF document text
    • https://rarinuda.weebly.com/uploads/1/3/5/3/135349313/katetinesojorod-gomeroxuru-ketobisulavo.pdfIn PDF document text
    • https://cdn.sqhk.co/vugomupuzisa/KhbhaPY/sound_tone_test.pdfIn PDF document text
    • https://cdn.sqhk.co/nadoranur/hfgjyhb/girivux.pdfIn PDF document text
    • https://cdn.sqhk.co/vovewotutal/4THmqJD/bulleit_blenders_select_mash_bill.pdfIn PDF document text
    • https://rodedewosesuge.weebly.com/uploads/1/3/6/0/136010241/piginezorawunodut.pdfIn PDF document text
    • https://cdn.sqhk.co/javukapegami/3hjghjh/duzerepuboburuke.pdfIn PDF document text
    • https://cdn.sqhk.co/jomonufo/ighejdj/adderall_dosage_by_weight.pdfIn PDF document text
    • https://cdn.sqhk.co/gogojelawov/XeAgdu7/94673307515.pdfIn PDF document text
    • https://cdn.sqhk.co/bitowiso/BtbQOgc/nasa_moon_news_live.pdfIn PDF document text
    • https://tekerigaxigo.weebly.com/uploads/1/3/4/7/134702693/zajeti_migubiw_zumofemolokiw.pdfIn PDF document text
    • https://falatunasozenu.weebly.com/uploads/1/3/4/7/134762474/4393384.pdfIn PDF document text
    • https://vazanopika.weebly.com/uploads/1/3/4/8/134896022/0d405.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/rilexazejuzovep/beporiradit.pdfIn PDF document text
    • https://s3.amazonaws.com/gotitibekovi/jexewowuv.pdfIn PDF document text
    • https://s3.amazonaws.com/gisujubolidine/razafuratak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef809394-fc62-478f-8b4d-38ddda674393/mojunurunelasupopa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b77d6c3-572a-490b-8302-990e096d3468/avtech_4ch_h.264_dvr_software_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/353e3efa-d631-4186-ab88-cc348b181a07/what_are_some_patient_safety_initiatives.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfcd5eea-a06e-4f1c-8944-7c8c190df338/nuxobuwetazagonibazepuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fcefe4ce-61b7-42b5-a1d6-46bf7c730252/retolekamitaviberemoniv.pdfIn PDF document text
    • https://s3.amazonaws.com/mokamoba/65778418603.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34404aff-0b45-400d-a2e4-5de23eb01266/58534642701.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3a69e86-c377-458f-8cdb-b907dc137d0c/6830114296.pdfIn PDF document text
    • https://s3.amazonaws.com/datarofapakil/gestational_diabetes_guidelines.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_off0000d9b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B1 6020 bytes
SHA-256: a97f2d0e1e397ce236d97fa93b2db454844db464c9e183a0f016dff887a9040a
font_01_sfnt_off0000ee11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE11 10600 bytes
SHA-256: a7e3f7bd97750245fbd03cf443cace79b7f558b38eb2e1369bb8a10837e4451a