Malicious PDF — malware analysis report

Static analysis result for SHA-256 885efbd9609d0375…

MALICIOUS

PDF

90.3 KB Created: 2021-03-29 00:49:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: b903b52e181dddb35871f579c60fdae2 SHA-1: b5702e118c9739238df0d422b305bd8de23b2d32 SHA-256: 885efbd9609d0375e038266d44d6483d6fe5c00d50256f7361022bee6bd30b1d
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 hosted on disposable domains, suggesting a link farm or SEO poisoning tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as phishing or trojan activity. The document body, though heavily obfuscated, contains keywords related to search terms, reinforcing the lure mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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/award?keyword=afspa+jammu+and+kashmir+pdf PDF link annotation
    • http://dream-stat.ru/futevixevigokozalidisigqgulh.pdfIn PDF document text
    • https://pagafika.weebly.com/uploads/1/3/5/3/135339488/marezukusilo-baduza-vabelofinazuzu.pdfIn PDF document text
    • https://cdn.sqhk.co/zojixemem/jgdgjAN/mortal_kombat_costumes_scorpion.pdfIn PDF document text
    • https://cdn.sqhk.co/vixemujomu/jejgtUt/47680791895.pdfIn PDF document text
    • http://miiliioner.xyz/openpilot_cc3d_firmware_downloadgcg42.pdfIn PDF document text
    • https://cdn.sqhk.co/kizulajeli/hgOieuO/simply_piano_premium_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/junikesiza/gcKgggg/rinorugidule.pdfIn PDF document text
    • https://cdn.sqhk.co/kusedesomawa/giWihIv/voxel_color_jumping.pdfIn PDF document text
    • http://vuzisebepuda.iblogger.org/update_word_document_template.pdfIn PDF document text
    • http://boevoenlp.com/39866071429g1gyz.pdfIn PDF document text
    • https://cdn.sqhk.co/merabuvi/ciVjfhg/summoner_s_companion_for_lol_apk.pdfIn PDF document text
    • https://kitigenuripoduj.weebly.com/uploads/1/3/1/0/131070171/vosidamo.pdfIn PDF document text
    • http://siteznakomstv69.space/30211515926pzjyy.pdfIn PDF document text
    • http://debegezuvume.iblogger.org/redagipamijaluso.pdfIn PDF document text
    • http://meetcabinets.xyz/462364218210gdcj.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/07069541-dcb7-4d91-b466-00ba40aebd80/2006_honda_civic_ex_coupe_oil_change.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f95d75b-961f-4c1b-ab1f-7f1db93b7cd7/alpine_cde-hd149bt_wiring_harness.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc057d44-7ba8-4c54-82be-5af4c15e1c1b/is_there_a_mortal_instruments_city_of_ashes_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34f37cd8-46f9-486c-a5bb-edf64ccf8fff/37777146554.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13d041be-4eb9-42cd-acec-66132639f982/4287661271.pdfIn PDF document text
    • http://bozulilem.epizy.com/lysistrata_with_line_numbers.pdfIn PDF document text
    • http://dirunor.rf.gd/ansys_mechanical_apdl_for_finite_element_analysis_1st_edition.pdfIn PDF document text
    • http://sefogubijisep.epizy.com/donald_barthelme_cuentos.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_off0001220a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1220A 5380 bytes
SHA-256: bd6fbda6955f21211d90230d19d8f2cb1fb7ab82399075afdc3b1cefd3de1095
font_01_sfnt_off00013436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13436 11176 bytes
SHA-256: 56995e7a41c5efc72dfd1f7207c5552bf7ff9c346f9905663c79c4bff36d0230