Malicious PDF — malware analysis report

Static analysis result for SHA-256 40ae5cd46a6a7551…

MALICIOUS

PDF

71.5 KB Created: 2021-03-04 22:21:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c51ac64e112cba22da843e9975684b08 SHA-1: 71c289256f60c2f9578e23d3ecf37cf3b3713ecb SHA-256: 40ae5cd46a6a75514cc9c44670bface3071be803c4ad15de3c53e42e6f82ca29
156 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, identified as a PDF link farm, suggesting a malicious intent to manipulate search engine results or redirect users to potentially harmful content. The ClamAV detection and ML classifier further indicate maliciousness, specifically flagging it as a phishing trojan. While no scripts were directly extracted, the presence of numerous external URLs points towards a phishing or content-serving attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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
  • 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://midufefew.ru/aws?utm_term=astm+b209+pdf+free
    • https://dalujukonuxuda.weebly.com/uploads/1/3/1/1/131163933/magomuga-norutovitesewu-zalasudodo-sevevopakonava.pdf
    • https://musibagufes.weebly.com/uploads/1/3/4/5/134587398/neraz.pdf
    • https://tiruvodeg.weebly.com/uploads/1/3/4/8/134892329/fefc0c00.pdf
    • https://lotaximadezepa.weebly.com/uploads/1/3/1/3/131379514/9232133.pdf
    • https://tozusasulinun.weebly.com/uploads/1/3/4/8/134872335/mowavakuzukavu-dojedupani-xodopapajapek-pijafijop.pdf
    • https://mitumeme.weebly.com/uploads/1/3/4/8/134879381/xiredinapebel.pdf
    • https://saguwaxofules.weebly.com/uploads/1/3/2/6/132681351/vajipaloset.pdf
    • https://bazafegaxu.weebly.com/uploads/1/3/1/3/131383427/wenufowesufupesa.pdf
    • http://dusetufo.22web.org/using_the_ti-84_graphing_calculator_with_linear_equations_worksheet.pdf
    • https://sulomotosepotu.weebly.com/uploads/1/3/4/7/134744650/fipox-jamuxejifeg-zewinaxaf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jipinasin.epizy.com/dimuruzuja.pdf
    • https://28a90398-13b1-4b58-b54c-ed045a6bddf2.filesusr.com/ugd/7e9e1f_6369adb3845848f9a34c28798fe56067.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0db86211-e587-440b-9f79-37262eff9346/dungeons_and_dragons_online_solo_class.pdf
    • http://kizarepopudoso.epizy.com/fugexufidijuxopewejesome.pdf
    • https://ddb0fe67-a09a-413d-b59a-c21b1dde3186.filesusr.com/ugd/3f0e57_e33eda1d532d40d5a207fc2247100e85.pdf?index=true
    • https://uploads.strikinglycdn.com/files/63e64f4f-f9ea-4412-b950-ab1862163f3a/berserk_volume_14.pdf
    • http://relotetuje.rf.gd/android_studio_affected_modules_app.pdf
    • https://69cf8a46-0d3d-4b71-8fd1-93df925da18e.filesusr.com/ugd/e4064d_ba2ed2b2c99840e78dfcb57435b110b3.pdf?index=true
    • https://b3d988c2-7a7d-4c3c-9141-221b6550481e.filesusr.com/ugd/9dda13_2d9ac4aefac944808a7b30854270b5fd.pdf?index=true
    • https://0e9c393c-9feb-4465-ae9d-4486bea7a644.filesusr.com/ugd/4b68be_b7c1ab641d8e40b689a6279fc13e4a81.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e688fc85-7450-4659-8be2-6eb98778d8cc/85750699960.pdf
    • http://puwagof.rf.gd/diagrama_de_flujo_significado_de_los_simbolos.pdf
    • https://uploads.strikinglycdn.com/files/5e82f153-a129-4cb8-81dd-630300547e3a/what_meat_is_prosciutto.pdf
    • 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_off0000da44.bin
e629568bab24f4c643f70d29bbfd27efc24e42f2b25c301c61bdeb6faa9c10ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA44 5504 bytes
font_01_sfnt_off0000ece3.bin
dd9e6d53a0417b2d78e9fa196f7a75b8e1ccf1ab7015a6481624e20c2da40f38		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECE3 10524 bytes

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