Malicious PDF — malware analysis report

Static analysis result for SHA-256 368c78734c6bc4fc…

MALICIOUS

PDF

81.8 KB Created: 2021-04-03 07:40:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: ca7cf4e6fa2f52e408353f9f50ed9cce SHA-1: 15fb504acee92ab72ea33b720c3c5223f60204ae SHA-256: 368c78734c6bc4fc74b864dcc78de6d13812eda5dbec4541c3f26007829d3113
244 Risk Score

Malware Insights

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

This PDF document is classified as malicious by ClamAV and an ML classifier, and contains numerous links to external websites, many of which are hosted on disposable domains. The document body, though heavily obfuscated, contains text related to 'Bisection method example problems with solution pdf', suggesting a lure to attract users interested in academic content. The primary malicious URL identified is https://yafferge.ru/award, which is flagged as a redirector to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/award?keyword=bisection+method+example+problems+with+solution+pdf In PDF document text
    • https://wuwogijate.weebly.com/uploads/1/3/4/8/134886767/bovufokirawu_gugutap.pdfIn PDF document text
    • https://lakowabanitewot.weebly.com/uploads/1/3/4/8/134898259/605638.pdfIn PDF document text
    • https://cdn.sqhk.co/zutoruxutu/Qiejvhb/personal_improvement_plan_template_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/tifesiwafo/jevKzHi/baby_girl_song_lyrics_by_joeboy.pdfIn PDF document text
    • https://xitozenajoxoge.weebly.com/uploads/1/3/2/6/132681812/9571576.pdfIn PDF document text
    • https://dajexuxeguse.weebly.com/uploads/1/3/4/8/134859846/a2703933.pdfIn PDF document text
    • https://nolenefin.weebly.com/uploads/1/3/4/6/134629259/8201938.pdfIn PDF document text
    • https://zinivopupo.weebly.com/uploads/1/3/4/3/134386920/3399192.pdfIn PDF document text
    • https://repawuwo.weebly.com/uploads/1/3/5/3/135313919/nusigomipeboxul_kujiko_fajawasagela_nemufaramok.pdfIn PDF document text
    • https://bevamiwe.weebly.com/uploads/1/3/0/7/130739198/fb3f7.pdfIn PDF document text
    • https://difanewoxapazu.weebly.com/uploads/1/3/5/3/135321324/5323233.pdfIn PDF document text
    • https://pemalerokefoge.weebly.com/uploads/1/3/1/6/131606165/7282080.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ea1c515-ed9a-4955-844e-14afb7403426/what_does_the_elephant_symbolize_in_the_elephant_vanishes.pdfIn PDF document text
    • https://s3.amazonaws.com/dogazisuze/zamowakojokozelaluxofej.pdfIn PDF document text
    • https://s3.amazonaws.com/wajufifenoxuj/15727461111.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5886bb6f-bcb3-4510-a816-5c09e53ad2ce/venazuxedufuvawedav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/417da4be-0b3f-43a7-8d9d-8977259e7803/chamberlain_41a5021-1h-315_troubleshooting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d3f179a-343a-4a59-98c1-618b02d7ea2b/biloxoxexefam.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_off0000e7bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7BF 5744 bytes
SHA-256: b19d34d87eee48727fe684d628f537d3640935d0a252c5d71d9429711dd6dbf4
font_01_sfnt_off0000fb34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB34 11972 bytes
SHA-256: d9688f703d3ad6303ae3625a8b192d5d6d738e735e56b41ee1e74354d0daa970
font_02_sfnt_off0001246d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1246D 16144 bytes
SHA-256: fb10e5badbbf29d6a05184c763452604a6d256f7c208a2bb674868c670b14a78

Open this report in the interactive analyzer, or submit your own file for analysis.