Malicious PDF — malware analysis report

Static analysis result for SHA-256 56b3e37b9a43b886…

MALICIOUS

PDF

74.2 KB Created: 2021-06-07 22:35:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2c7e8ebb8563087f63533409631e9ecd SHA-1: c0c2ea5ed250214422389e9693606822f062dfd1 SHA-256: 56b3e37b9a43b886eaf96aafcfce55c215db59af7515a13590dd55d8bc9ca104
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 0.9991

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://coretry.ru/pbw?utm_term=beer+and+johnston+statics+11th+edition+pdf PDF link annotation
    • https://rejafolurolege.weebly.com/uploads/1/3/0/7/130740622/7555950.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379722/normal_5ff9b61284757.pdfIn PDF document text
    • https://levoveto.weebly.com/uploads/1/3/4/8/134897684/fixake_bixifogesadus_zabanimazulijok.pdfIn PDF document text
    • https://nuxowodevuj.weebly.com/uploads/1/3/4/6/134609076/4091.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382952/normal_5ff6772fe8ac6.pdfIn PDF document text
    • https://wevopuvigamez.weebly.com/uploads/1/3/4/3/134320632/7826701.pdfIn PDF document text
    • https://fixivure.weebly.com/uploads/1/3/4/8/134888316/suzewobufuw-foxina-girali.pdfIn PDF document text
    • https://xawiwewediwo.weebly.com/uploads/1/3/4/0/134017039/168e10e328391.pdfIn PDF document text
    • https://zefojakafi.weebly.com/uploads/1/3/0/7/130776787/ponari.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377101/normal_60280fcf033bf.pdfIn PDF document text
    • https://zolezuborejizo.weebly.com/uploads/1/3/4/4/134444688/vufafekavim_jegalafoj_vokoribuwiwe_vofonepinafuw.pdfIn PDF document text
    • https://niwupusig.weebly.com/uploads/1/3/1/4/131438062/bb988189f0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xigivesupi.pbworks.com/f/zubinujuzezegogawafixipij.pdfIn PDF document text
    • http://bopelijexuf.pbworks.com/f/tiwojomijiw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/400cd939-984e-41a9-9b5c-d2bae84baf04/been_left_for_dead_sister_youre_better_than_that_lyrics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f3cb55e-e462-4f74-8d46-9fe1145a8ec3/kitezejesunagebagodop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e66ad80e-2551-4a57-9f15-9c0eb50cf7f3/14718357061.pdfIn PDF document text
    • http://kepodaworo.pbworks.com/w/file/fetch/144803910/how_to_clean_a_sundance_spa_filter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7bede9b-e190-4e59-aead-995066c4e690/how_do_i_reset_my_brother_printer_toner.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b51f5438-930d-443d-a8d4-2a60c693bbcd/gogaji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfec364e-d064-4dff-aaee-7163acd60877/jazz_piano_backing_tracks_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/110707f3-9f19-4b98-80af-72b6b15ded7d/5th_grade_workbooks.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d70f2a31-c259-44b3-b94c-d08d8c786987/latavebedopesavi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26c8d956-0e14-4bf9-a4b5-067268ad02ae/31848832433.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_off0000e3ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3CE 5388 bytes
SHA-256: 5c02f7dd4dc6532e28a2d9b77eace4e220d562b2de06578fe11e05b802bb20de
font_01_sfnt_off0000f62d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62D 10820 bytes
SHA-256: 3fb52ea3ef0c34644beb2d34cb55ac3fcbbec4af319d49f8f8414c9cfd854645