Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd073b5b606901f0…

MALICIOUS

PDF

94.8 KB Created: 2021-05-29 19:56:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 65c1eb1a337b21e888d1987438193c3b SHA-1: c4c51271731f4514a8c5665a0a270f00932ee8b7 SHA-256: cd073b5b606901f0159833ac5db342365dfeb8c14f61ea2f4c4c20a6a24ca60d
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 0.9982

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://xajibur.ru/123?utm_term=facebook+lite+apk++apkmonk PDF link annotation
    • https://wafodefa.weebly.com/uploads/1/3/4/4/134480145/didada_wexonibazonepi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446491/normal_5ff150928f134.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417315/normal_5feb74dcd1465.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411702/normal_603ba51f9568a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463533/normal_5fd95ed132a78.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4367013/normal_60afe96e85028.pdfIn PDF document text
    • https://tozafutesaf.weebly.com/uploads/1/3/4/9/134900259/deralumepin.pdfIn PDF document text
    • https://zopizegojuv.weebly.com/uploads/1/3/1/3/131380511/fekogozixu.pdfIn PDF document text
    • https://nidimikijugura.weebly.com/uploads/1/3/4/7/134710695/321659.pdfIn PDF document text
    • https://mugebixivezir.weebly.com/uploads/1/3/1/4/131484268/7476340.pdfIn PDF document text
    • https://josozigigararu.weebly.com/uploads/1/3/2/6/132681886/1265800.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483081/normal_606adf9170d73.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379839/normal_5fe00f535b1da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450337/normal_606c45eb4c7da.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://uploads.strikinglycdn.com/files/526fac6f-a46c-49f4-af57-389c2c32e429/blackpink_summer_diary_in_hawaii_vietsub_full_ep_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/313e73bc-8b00-418c-aa60-f96cafb87e13/dominos_handmade_pan_pizza_dough_recipe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bd5f7c6-8a10-4c21-bfab-c110c29d336e/54706147075.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e4b0d26-e2e6-4d3b-9436-ceeea8302bac/72454963437.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23fb9d96-26cc-40e0-8f3a-3c6704a61eaa/college_writing_skills_with_readings_10th_edition_ebook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f42f544-a54f-4c68-a45e-9b082abb8187/15528599430.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61712cfc-2dc8-467c-a95a-2475f807981b/asus_m4a785td-v_evo_motherboard.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c26d01ec-193b-4fb1-bd33-572f78ab2d57/11893413298.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/142fa8a5-3123-4322-bccc-ca570a010e22/gavabepinixadojadusob.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10685 4752 bytes
SHA-256: 7c82bff97e014842d98ed7069bcbbf3ef559f981b9c85a46dcbfc15bc4c11989
font_01_sfnt_off0001168b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1168B 22384 bytes
SHA-256: fe750ce65ad7782c1578ff324b23aa709d9bb687258c9ea36e28cbe75eea5945
font_02_sfnt_off000149f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149F2 16204 bytes
SHA-256: 31aa257675234f953cb39254c73a0c002637764ec2691c470e0912636c3685cf
font_03_sfnt_off00015f20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F20 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c