Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fb077d2a1e96a0a…

MALICIOUS

PDF

70.5 KB Created: 2021-05-29 14:27:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: f80e569dc3056188fde9b45616135190 SHA-1: 7709ba4bc47efc8e6e906b5531b76e796d188feb SHA-256: 8fb077d2a1e96a0adc74f9b97ed79036e1e8d940492b439bca149e5955e46710
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, indicating a link farm or SEO spam operation. The ML classifier and ClamAV both flagged this PDF as malicious, with ClamAV specifically identifying it as 'Pdf.Phishing.Trojan'. The document body, though heavily corrupted, contains text related to 'anatomy and physiology coloring workbook answers chapter 5', suggesting a lure to attract users searching for this content. No scripts were extracted, but the presence of numerous external links and the high confidence malicious verdict suggest a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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://resalured.ru/strik?utm_term=anatomy+and+physiology+coloring+workbook+answers+chapter+5 PDF link annotation
    • https://vosaxoro.weebly.com/uploads/1/3/4/4/134469305/b02fe8c2d83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421354/normal_6041f6ce83a58.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417315/normal_6034de0fc2f03.pdfIn PDF document text
    • https://nirasiban.weebly.com/uploads/1/3/4/3/134344158/4851084.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387229/normal_60691b09a0201.pdfIn PDF document text
    • https://gelurojaf.weebly.com/uploads/1/3/4/6/134697462/genat_tojupatetodati_pipiwafimize.pdfIn PDF document text
    • https://bakogala.weebly.com/uploads/1/3/1/3/131384254/jolimupap.pdfIn PDF document text
    • https://noragunefide.weebly.com/uploads/1/3/1/6/131637841/7280420.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409413/normal_606e0035e437f.pdfIn PDF document text
    • https://femomupine.weebly.com/uploads/1/3/4/4/134458898/wexepedowewojuwu.pdfIn PDF document text
    • https://bodonejuw.weebly.com/uploads/1/3/4/6/134686214/b3f9b252878.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465393/normal_5fd17f1d2539e.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/fdee113c-ac0b-4655-ade2-6a0cff1faa46/is_artemis_fowl_good_or_evil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69ba5b6e-9a05-4118-a638-7fcde57f550c/pobirozitokizakidofu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af1c9343-ebee-447f-ae62-5f7542c9a6b0/do_skullcandy_hesh_2_work_with_xbox_one.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/723b9af6-446e-4e3f-9fcd-6baafb769d06/how_do_i_connect_my_echo_dot_3rd_gen_to_wifi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e6b1de0-dceb-43c0-af63-23ff012b5394/maytag_bravos_washer_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec07f24a-4dce-40e1-8232-715838074199/physics_solution_class_11_chapter_4.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e96c618b-c020-4351-805a-2c2b9e5c463e/safety_first_everfit_car_seat_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79df404c-36f7-456b-970f-aece6bbcee1d/10781185419.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b34bf797-8f80-44c3-a203-72f1c0b8ae12/wuwobe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/382836b9-3b85-4a56-a148-809d6629cb4c/can_you_reverse_search_a_cell_phone_number.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_off0000d4a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A2 5996 bytes
SHA-256: ee4951165314afd975d131998a2c029f4dc9080b03176cd93faa9ea4a21de6d2
font_01_sfnt_off0000e900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE900 10584 bytes
SHA-256: d762d814ac24ab169acfb4ceb5011dfb211c3fdd913d06a8a5a8ee36d5a003ee