Malicious PDF — malware analysis report

Static analysis result for SHA-256 bac44ffe2f6b37f7…

MALICIOUS

PDF

79.4 KB Created: 2021-03-18 14:29:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: bb460e89437f188f5799eb081653fa4a SHA-1: 1942d7d414c1fb55088b83e389d5a3e8561ce6dd SHA-256: bac44ffe2f6b37f7c0bb27825d0fa591dbba194a786bc19ea29053350dfe0e45
204 Risk Score

Malware Insights

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

The PDF contains embedded links pointing to known malicious redirector infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The presence of multiple links on disposable hosting suggests a link farm designed to obscure the final malicious destination, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/wix?keyword=pineville+junior+high+open+house In PDF document text
    • https://static.s123-cdn-static.com/uploads/4413696/normal_6003818ebbe82.pdfIn PDF document text
    • https://cdn.sqhk.co/kinanekoxo/djfhijb/redcon_pre_workout_stack.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391037/normal_603d4606554fd.pdfIn PDF document text
    • https://cdn.sqhk.co/zozusexub/pihawjj/commercial_electrical_load_calculation_worksheet_excel.pdfIn PDF document text
    • https://cdn.sqhk.co/difigobon/W6idWhb/who_is_brain_teasers_and_riddles_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367645/normal_6016166077778.pdfIn PDF document text
    • https://cdn.sqhk.co/xogiwusumo/ZBGVzOi/short_life_2_level_4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479213/normal_600d279e0b020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457281/normal_6034d1b5ba15d.pdfIn PDF document text
    • https://dukowitemodilel.weebly.com/uploads/1/3/5/3/135316140/1529845.pdfIn PDF document text
    • https://cdn.sqhk.co/finulepaf/gdxgj5c/uber_driver_salary_in_texas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447434/normal_6033a89d50f4e.pdfIn PDF document text
    • https://tukuboxux.weebly.com/uploads/1/3/4/5/134510407/6961375.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455183/normal_5ff2baed532c8.pdfIn PDF document text
    • https://dopotalufiru.weebly.com/uploads/1/3/4/6/134601398/d2f9dd2613.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499329/normal_601f997b59341.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/gazitif/bhojpuri_chaita_video_mp4.pdfIn PDF document text
    • https://7915398d-c9c2-4241-abdb-40cf742e4b8d.filesusr.com/ugd/d4df0f_07e602151f1b4c2f8b6158bb7d570d9a.pdf?index=trueIn PDF document text
    • https://7a69a04d-b0b3-478e-a927-895b34d3dd44.filesusr.com/ugd/159848_6e95d6bdbfa042cabae5096097f252f6.pdf?index=trueIn PDF document text
    • https://e25b5f36-ee09-4010-8803-019b2853a23b.filesusr.com/ugd/c34eac_55f7b34b5a48470d848725410b1d6229.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/turip/coreldraw_x7_64_bit_full_version.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatesawodiji/bio-_rad_stock_performance.pdfIn PDF document text
    • https://a54de82d-0003-4787-801b-d7ee719c780a.filesusr.com/ugd/8d57bd_eaf8c5585c734c11a0ace616887c66bc.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC7 4812 bytes
SHA-256: bc8d1221480ead355c768ae049ec35ae7cd93ba2ce28fda664d2686dad5319ae
font_01_sfnt_off0000fb15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB15 10800 bytes
SHA-256: 5954997945614a62a9fd7120207830248a634dd4dfd1b5ef0cc56e564b1a3540
font_02_sfnt_off00012014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12014 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34