Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1a6f32fae0c9c40…

MALICIOUS

PDF

83.5 KB Created: 2021-02-07 09:59:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 7a2076e8dda8d563b524ceb4b71b3e8f SHA-1: 28083e84e0ca958e7d0f2e5b4f4ba504e02dea21 SHA-256: d1a6f32fae0c9c40ea08027e28990d570349786f9130903cf04cfe320a070ee8
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, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://jottigo.ru/aws?utm_term=caries+risk+assessment+form+0-+6 PDF link annotation
    • https://womomoko.weebly.com/uploads/1/3/4/8/134848640/lenenunibepolukonu.pdfIn PDF document text
    • https://sifudalumavobu.weebly.com/uploads/1/3/2/3/132302711/dawotujekamo.pdfIn PDF document text
    • http://secret-empire.ru/pemeriksaan_coombs_testxozp4.pdfIn PDF document text
    • http://bezigex.iblogger.org/gafupe.pdfIn PDF document text
    • https://movalibixijol.weebly.com/uploads/1/3/2/6/132682530/tapiza-felexetukiw-nixokera.pdfIn PDF document text
    • http://fitness-ital.fun/plastic_cookie_sheet_liner03nua.pdfIn PDF document text
    • http://interbank.link/25828959327k6km7.pdfIn PDF document text
    • https://mekuzawejonoma.weebly.com/uploads/1/3/1/6/131606345/1238230.pdfIn PDF document text
    • http://rogosevit.22web.org/messenger_app_for_android_5._1.pdfIn PDF document text
    • https://pojajowose.weebly.com/uploads/1/3/0/8/130813819/dolidodu.pdfIn PDF document text
    • https://tojabefe.weebly.com/uploads/1/3/2/3/132303019/mojikexot.pdfIn PDF document text
    • http://copyright-notice-ig.com/xegawokojovql6i2.pdfIn PDF document text
    • https://dexazime.weebly.com/uploads/1/3/1/4/131437554/zotobamozepotimegeg.pdfIn PDF document text
    • https://pepomujotopulog.weebly.com/uploads/1/3/4/8/134873529/8812071.pdfIn PDF document text
    • http://goloszauniver.fun/leap_of_faith_water_slide_slow_motionddaao.pdfIn PDF document text
    • https://xuduwenonotowud.weebly.com/uploads/1/3/1/3/131379268/nerezogilabi-ruximudetenek.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/murudute/graphite_oxide_and_functionalized_graphene_sheets.pdfIn PDF document text
    • http://sajetubaj.epizy.com/pobokifovesuredud.pdfIn PDF document text
    • https://s3.amazonaws.com/wezukep/happier_piano_sheet_music_easy_with_letters.pdfIn PDF document text
    • https://s3.amazonaws.com/dusubonifu/rodema.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/mac_command_line_json_formatter.pdfIn PDF document text
    • http://pufupivati.epizy.com/nonafutejatuxukanexa.pdfIn PDF document text
    • http://jilovin.epizy.com/nuwim.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f26d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26D 5180 bytes
SHA-256: f7b09f1d382c6bdf1e8ec47866000ddf9cb4796ef95de4b05eeeaee0f9cf52b2
font_01_sfnt_off000103f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F8 11292 bytes
SHA-256: 0f29700832df80b8a2deb4e3695d9398eba6599a31d69d91a3a1e82e9e8bb083
font_02_sfnt_off00012aac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AAC 16140 bytes
SHA-256: 159427b32ed66bfbde86def5e6c2992bde67dfb25400c4000a37c9b59b949b61