Malicious PDF — malware analysis report

Static analysis result for SHA-256 39aadb1b5931d028…

MALICIOUS

PDF

77.9 KB Created: 2021-05-15 18:20:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 7def2523cc3f640396a4f1d22c1c8224 SHA-1: 5960a3b38a81217db9936d6476bcc453d617a093 SHA-256: 39aadb1b5931d02826a2fb5a0d3248b8da24d65bdebe0d45d42c44fbb1bf3263
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 0.9995

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://crophysi.ru/strik?utm_term=interview+questions+for+administrative+assistant+in+higher+education PDF link annotation
    • https://sebinegovana.weebly.com/uploads/1/3/4/0/134095930/11272156b53fd.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/hgjfEja/pdf_annotator_free_portable.pdfIn PDF document text
    • https://fenikazegalo.weebly.com/uploads/1/3/1/3/131379965/2200594.pdfIn PDF document text
    • https://cdn.sqhk.co/dedogupazib/jhjd8A6/hello_neighbor_cops_and_robbers_game_download.pdfIn PDF document text
    • https://cdn.sqhk.co/liregagibago/S5hb5uh/sewokakiwifug.pdfIn PDF document text
    • https://cdn.sqhk.co/fiwujumejuf/ZChhcha/dewajuliga.pdfIn PDF document text
    • https://wisiwojapano.weebly.com/uploads/1/3/4/8/134896472/zuxorem_joxukub_datagavufoma_pipidorovabojig.pdfIn PDF document text
    • https://cdn.sqhk.co/vefusujix/bieMhcf/home_design_my_dream_garden_apk.pdfIn PDF document text
    • http://gexopidikimo.mygamesonline.org/mortal_engines_full_movie_download_in_hindi_filmyzilla.pdfIn PDF document text
    • https://cdn.sqhk.co/bikakigiben/bqD2qVw/viridian_green_laser_lcp_2.pdfIn PDF document text
    • https://suludexa.weebly.com/uploads/1/3/5/3/135314517/795c1262f6533f.pdfIn PDF document text
    • https://zemovawid.weebly.com/uploads/1/3/4/6/134608463/wiwusuvedazer_todeso_kuwoxezo.pdfIn PDF document text
    • http://kefijor.mygamesonline.org/athlean_x_max_size_reddit.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://acfc0e76-311d-46af-9c13-f46c112eb424.filesusr.com/ugd/f90bad_00793eb4678e49c085b91ca433263b9b.pdf?index=trueIn PDF document text
    • https://245ae9ba-e923-43ed-bc11-30ed5d1acd78.filesusr.com/ugd/051519_ac4c1431889b461aaee4e9f66739458b.pdf?index=trueIn PDF document text
    • https://f8d82b49-d438-4da2-b906-f876cb6fe635.filesusr.com/ugd/12dc78_e80e29c126da48938d16fb095bc3c7ca.pdf?index=trueIn PDF document text
    • https://02314edc-d025-420b-9d62-795437f25c47.filesusr.com/ugd/4f0fc1_4b927f44eb4f4593afad4ceac7a4f403.pdf?index=trueIn PDF document text
    • https://9dc8676a-0e58-44ee-a512-e339c7094702.filesusr.com/ugd/7c0652_62d52e77cb9e4c038f6ea46377a603db.pdf?index=trueIn PDF document text
    • https://336ddc11-c37d-4cd6-9685-7accad2975f7.filesusr.com/ugd/479fa9_1d2521787ab74f4da0998e693dbc0aeb.pdf?index=trueIn PDF document text
    • https://ff19a39e-637c-4fc6-80cc-750024e8dd37.filesusr.com/ugd/d217e2_c227eb7bfa4441cb9a1e0783af92a809.pdf?index=trueIn PDF document text
    • https://c1cb471f-fc5c-4ef2-b3e1-4d0d0d09d135.filesusr.com/ugd/cc5b41_6ee3bbd1820a4506a2b24159e2cede13.pdf?index=trueIn PDF document text
    • https://11f44e1d-c86f-4be6-baa1-90970e7c24f5.filesusr.com/ugd/a298ce_b32c6a589c92419ea494c773f1e64a07.pdf?index=trueIn 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_off0000f0ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CA 5620 bytes
SHA-256: 6d61b4d5b8dd40cf01108c79c0dbb4b3b09e52035353752487281b8ba04cfce0
font_01_sfnt_off000103d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D1 10968 bytes
SHA-256: 65364f3529772da7bc3c9f2e73f8ffc5f4ab7710d58449f3b82e63657b9b4d44