Malicious PDF — malware analysis report

Static analysis result for SHA-256 8dcbf1383de7b737…

MALICIOUS

PDF

85.7 KB Created: 2021-03-10 04:05:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 2780c23cea987ecb987e1737e7b82e52 SHA-1: 28e678c5cd6649c947d0dbf7886aaf0b2bef4d00 SHA-256: 8dcbf1383de7b737f2216dd9d5d966b7029aa155c9aaa30e5a2f01b06a362168
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO spam operation. 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 links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://bologen.ru/aws?utm_term=big+little+lies+song+season+1+episode+2 PDF link annotation
    • https://cdn.sqhk.co/saboxiwago/chhYxaD/toolbox_murders_case.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405193/normal_5ffc66200a37a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482413/normal_5ff1d78055437.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471960/normal_6047f57a624b8.pdfIn PDF document text
    • https://cdn.sqhk.co/noviraxat/ia01grK/2010_ford_super_duty_towing_guide.pdfIn PDF document text
    • https://dezubawutojowi.weebly.com/uploads/1/3/1/3/131398539/6c8b63.pdfIn PDF document text
    • https://cdn.sqhk.co/favosejo/TghbVgl/pong_table_painting_ideas.pdfIn PDF document text
    • https://cdn.sqhk.co/vimerokil/ghk4g7r/zara_summer_sale_2020_usa.pdfIn PDF document text
    • https://jowidirususonin.weebly.com/uploads/1/3/0/7/130775515/medifixoxug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411273/normal_5fe72315b19c8.pdfIn PDF document text
    • https://xemubafuwifo.weebly.com/uploads/1/3/4/4/134475424/6978605.pdfIn PDF document text
    • https://cdn.sqhk.co/vuvesanap/lhhrXjj/petazafozafog.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/ecfc9002-0666-4f07-84f2-8510596a1b13/39180965564.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ffc1345-4e1e-431e-a7ef-f69d5a472483/kenmore_90_series_gas_dryer_motor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc121ba1-378c-4517-890d-01f13cf5ef3a/45539892291.pdfIn PDF document text
    • https://s3.amazonaws.com/figidireki/the_prince_2019_full_movie_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f60cd3d-683c-4eed-b3e8-71b534e7e994/whirlpool_cabrio_washer_f5_e3_code.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73c7e81e-739d-467d-b6c4-2f299604e904/bajapilexogitovem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86fe31b9-a750-432f-a5ba-6f38474959ad/scott_pilgrim_vs_the_world_movie_synopsis.pdfIn PDF document text
    • https://s3.amazonaws.com/sowirutelevolur/kekilat.pdfIn PDF document text
    • https://s3.amazonaws.com/figidireki/38954640864.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df19865b-6016-45b4-b741-ddb1f9e6906f/evenflo_triumph_lx_convertible_car_seat_forward_facing.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_off0000faf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF8 5264 bytes
SHA-256: 3f016e75172c5ddd8a61bcf5638c981e18a1f1c8309259f412c47698b38975b2
font_01_sfnt_off00010cff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFF 11568 bytes
SHA-256: 9373b4be46826e93d2ae660c7cd4b2a65dc8654dd3aade5d6014022fdfd75f6b
font_02_sfnt_off00013449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13449 16036 bytes
SHA-256: 9559dd1bd908241551916101fda3d445a26f5c4b506a1423f23393456f9d5940