Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8c8e2bc6231e2e2…

MALICIOUS

PDF

92.5 KB Created: 2021-03-31 01:41:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9e1d4178c3ec81312966f1b540fc458c SHA-1: 914ae645ac72487237784d1405f590f8f6f71489 SHA-256: c8c8e2bc6231e2e23302ee72565090b6a9bf9c3a0fed2acc27c6a707956a3c08
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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 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://botokaw.ru/123?utm_term=distributor+agreement+template+pandadoc
    • http://helplnstagramoffice.com/ozeri_scale_manualtenqo.pdf
    • http://prizinsta.info/players_5e_sheetuykf4.pdf
    • http://look-hotel.com/890076360549r2f3.pdf
    • http://topmassage.net/7854037275608g16.pdf
    • https://woninulanomawij.weebly.com/uploads/1/3/4/6/134670754/1773578.pdf
    • http://ampinternational.org/how_long_is_army_reserve_officer_trainingql7oy.pdf
    • https://vunorozixu.weebly.com/uploads/1/3/1/1/131163876/pipazenapugurotek.pdf
    • http://heartcenteredequestrian.com/78062041196s5t8j.pdf
    • http://barcaporirternet-interbank-pe.com/family_tree_template_microsoft_word_2013o8rab.pdf
    • http://itanah.space/xuxugudufomanirivu1t3b2.pdf
    • http://edarudost.online/what_is_a_99_year_ground_leasewhrxb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://71a0d42b-91d5-4e94-9338-ff69ca8a624b.filesusr.com/ugd/e5d5e5_d212e9bd1b5d4388b1de833c98193048.pdf?index=true
    • https://24d1f61b-f5c5-4d2f-8180-62589f44e8d8.filesusr.com/ugd/eed56f_f3998e8b7b00446ca0908a2ff07035a5.pdf?index=true
    • http://xebinuv.rf.gd/boondocks_gang_songs.pdf
    • http://pibodowisolizi.epizy.com/craftsman_6hp_air_compressor_rebuild_kit.pdf
    • https://a84030a7-2e48-4039-807a-383e2b7216cc.filesusr.com/ugd/c5d40f_b9a75079456b4d8788e5ebb4e18793d5.pdf?index=true
    • http://zukizibukuxupir.epizy.com/polarization_by_double_refraction.pdf
    • https://bf130ee1-1463-4c69-9604-1b23772ced92.filesusr.com/ugd/b4609a_16c9ec517bf3404f8b4afb93b8214bbb.pdf?index=true
    • https://968bac2e-1409-45a7-bd11-2c37eba47390.filesusr.com/ugd/c81504_897f5ccc75b2483385072341420a8845.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012dbb.bin
5a7352f15e1dd09f4713b5a7ca044d3e0204ebab255280e0d0c4d29165a4cd61		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12DBB 5532 bytes
font_01_sfnt_off00014077.bin
1fa1e58278171f01857905201745b6ff86897403723da5b709eaf223ddf7a866		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14077 10704 bytes

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