Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb665d8d51b8cc1a…

MALICIOUS

PDF

77.0 KB Created: 2021-03-11 10:54:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 450b584616198c5121361e303c34b95d SHA-1: 3c05fa6c9b8eba8c6633dab7097be27255040012 SHA-256: bb665d8d51b8cc1abe30c4ce6594a2b95e6a080e4b8cfb72a67a4a61c3191b31
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/strik?utm_term=why+is+my+paint+spray+gun+spitting PDF link annotation
    • https://cdn.sqhk.co/giwitosak/4Uijgdm/xomirajupimunivoru.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477167/normal_602e14bbc7f64.pdfIn PDF document text
    • https://cdn.sqhk.co/wiwevini/ijhthht/26478771523.pdfIn PDF document text
    • https://fotiterik.weebly.com/uploads/1/3/5/3/135328456/kowanafer.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423752/normal_5ffd48141bf1f.pdfIn PDF document text
    • https://cdn.sqhk.co/fofateze/bDNhgja/12111672458.pdfIn PDF document text
    • https://cdn.sqhk.co/bomaguvodar/elr0jiy/14406308338.pdfIn PDF document text
    • https://cdn.sqhk.co/jumifokujuje/S3dwioP/disorderly_definition_chemistry.pdfIn PDF document text
    • https://cdn.sqhk.co/zinoliwomi/hPyr9Sg/planet_alignment_september_13_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/susopavazane/fMjbhbw/53336296078.pdfIn PDF document text
    • https://tavadubamik.weebly.com/uploads/1/3/4/4/134473349/f1c38f797a070.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425229/normal_5ff8db3a4afb2.pdfIn PDF document text
    • https://cdn.sqhk.co/ponesigis/aN4fVif/89589657123.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393761/normal_6004affd9d05c.pdfIn PDF document text
    • https://cdn.sqhk.co/runenuti/iahaorN/pixexebegizufaf.pdfIn PDF document text
    • https://rofekituluz.weebly.com/uploads/1/3/2/3/132303072/78b58f0e10d4.pdfIn PDF document text
    • https://cdn.sqhk.co/kewawukufiju/ijVGZDD/super_mario_games_free_online_play.pdfIn PDF document text
    • https://zekilunadaxidub.weebly.com/uploads/1/3/4/6/134631079/9643aa49.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/furunumaroxun/wubazo.pdfIn PDF document text
    • https://s3.amazonaws.com/lowuwofuxali/vamepetow.pdfIn PDF document text
    • https://s3.amazonaws.com/polexebuj/chitralahari_movie_audio_naa_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/lovomijelun/ranupozuwikatumukub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/901758f0-6864-4ffd-9605-f4c4884da2bd/bipuxobapizumudekake.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49e0103b-ee11-4fdb-b39f-18eadc2f6c71/lazajaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c5a3f06-fe4a-4d20-88a0-bd6e66d7a149/leading_from_the_inside_out_the_art_of_self-leadership.pdfIn PDF document text
    • https://s3.amazonaws.com/fukepez/ableton_live_9_standard_manual.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_off0000f0cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CB 5316 bytes
SHA-256: eae0e03c2ac949a56d7213c1928faf679b54fa592c2969c0c9f8766159a781a1
font_01_sfnt_off000102c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C7 10396 bytes
SHA-256: 88e57eca8c1c9322607968914c28fe50db93a68e4d17f94e06a207e2f1fccc72