Malicious PDF — malware analysis report

Static analysis result for SHA-256 1390350758267f1f…

MALICIOUS

PDF

83.5 KB Created: 2021-03-15 04:41:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 3aaf75c6f794b53fc399db1d69e646b0 SHA-1: f77c6b7d40d9270aff6dd4c1d4110661a19dce2a SHA-256: 1390350758267f1f7a9b27b5d816b17efe5936fa270e48d93f6669d97de829f3
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 0.9990

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://kuzutuzo.ru/wix?keyword=coordinate+geometry+worksheets+high+school PDF link annotation
    • https://cdn.sqhk.co/zolilogifuxe/ShfggtJ/truth_or_dare_netflix_2.pdfIn PDF document text
    • https://cdn.sqhk.co/konidadelan/Ejhhihd/bike_riding_aching_legs.pdfIn PDF document text
    • http://jotafitosixa.getenjoyment.net/23010318927.pdfIn PDF document text
    • http://nanonewe.scienceontheweb.net/female_boss_quotes_instagram.pdfIn PDF document text
    • https://cdn.sqhk.co/vasozaponem/jfTfuhj/57927475114.pdfIn PDF document text
    • http://fejavodexata.getenjoyment.net/what_does_sunshine_represent_in_a_dream.pdfIn PDF document text
    • http://sutivetowit.mypressonline.com/ditirij.pdfIn PDF document text
    • https://cdn.sqhk.co/putuziboki/gZjaihR/pirates_of_the_caribbean_dice_game_rules.pdfIn PDF document text
    • http://tefitagesev.mypressonline.com/breville_smart_oven_pizzaiolo_pizza_oven_review.pdfIn PDF document text
    • http://zaxegod.getenjoyment.net/72428714955.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6a421494-2577-4416-904f-e17348f56b63.filesusr.com/ugd/85e76a_704167ea956d49598cbf4906cac9bbc7.pdf?index=trueIn PDF document text
    • https://32cf4326-ba62-484c-a3ca-05d02c2dd2e5.filesusr.com/ugd/0b46e6_c8c35a9f2d114aeea711fa43abe89fa9.pdf?index=trueIn PDF document text
    • https://dedb376b-efc3-4528-ac10-fc65d12f866c.filesusr.com/ugd/5f6074_2b208d1d3cc4438db90aed3b9e33a932.pdf?index=trueIn PDF document text
    • https://03df18d0-0a94-4077-8b44-1f3cf8b7c870.filesusr.com/ugd/23a6c3_2e21cd30ce844a728176d246f509056e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4280212d-6742-421c-935e-88f2af705951/chemical_equation_for_saponification_of_coconut_oil.pdfIn PDF document text
    • https://562c2315-396f-49d1-9e45-1236e049cb13.filesusr.com/ugd/ec0012_9aaafb8f590f4cab934375fde7191c92.pdf?index=trueIn PDF document text
    • http://fubavinexazixo.onlinewebshop.net/behaviour_modification_10th_edition.pdfIn PDF document text
    • https://729282ec-1290-4cbc-9302-cf8a24acd4c7.filesusr.com/ugd/42c189_2b8ef424777c4ad7b4c7521db9dbb827.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f25c94d5-c459-4bae-829d-bc827597996d/what_does_daring_mean_in_german.pdfIn PDF document text
    • https://1afae0f6-9e35-4dc9-9db7-5dbf78511926.filesusr.com/ugd/afe78f_21e8f34c184d41e78128c4b3a58a724f.pdf?index=trueIn PDF document text
    • https://13adc596-845f-4f4a-b539-e2c04a0a4b5a.filesusr.com/ugd/6e2da7_5a17c82dd8134613aceb48c58d870e55.pdf?index=trueIn PDF document text
    • http://taroveruwidiba.onlinewebshop.net/how_to_clean_a_m50_gas_mask.pdfIn PDF document text
    • https://d38713d8-f9e0-49bf-8e72-3f46774ce551.filesusr.com/ugd/b3faf5_65f1933f5aad4d0b8fb0b60f72248d44.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/adfe19c3-f887-4afb-807e-330d31bf68b4/50246996669.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c466dbc-c986-4eb4-8eec-7b4fa5849e12/how_to_learn_classical_arabic_fast.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF91 5516 bytes
SHA-256: fc2a9716ce6b0659a4cee2f8f2198e42c9da7787c00672f03abff5960c42a14a
font_01_sfnt_off00011237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11237 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off00011ac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC4 10784 bytes
SHA-256: 92acfa37623f62e5658c1c264aa020bf0198d7d114af043a68e461ce7ed025a5