Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6669f7b37267667…

MALICIOUS

PDF

79.5 KB Created: 2021-05-31 05:02:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d6030fb27364f0890400ecfc063397dd SHA-1: 619d9a7fc32fa95e3b830f49f2eca894fe20100a SHA-256: b6669f7b372676677056b97aa817342762bd20b8551fee681d26716c7044adb3
244 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure and a large number of SEO-related links. The embedded URLs suggest an attempt to direct users to potentially harmful sites, possibly for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • 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 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.
  • 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/strik?utm_term=what+size+batteries+does+the+ingenuity+swing+take In PDF document text
    • https://banavodix.weebly.com/uploads/1/3/4/6/134687022/39a5455.pdfIn PDF document text
    • https://jebunofom.weebly.com/uploads/1/3/4/4/134468214/60700f7.pdfIn PDF document text
    • https://bofipafora.weebly.com/uploads/1/3/0/7/130776763/vodubufirota.pdfIn PDF document text
    • https://givigifug.weebly.com/uploads/1/3/4/8/134858651/ff97308.pdfIn PDF document text
    • https://fisabovetusita.weebly.com/uploads/1/3/4/5/134597566/vopixamatekoko_fotubedot.pdfIn PDF document text
    • https://pirobubav.weebly.com/uploads/1/3/1/3/131380689/5005822.pdfIn PDF document text
    • https://wepujemu.weebly.com/uploads/1/3/1/4/131453456/f5b5e8055.pdfIn PDF document text
    • https://zajenutomu.weebly.com/uploads/1/3/4/1/134109216/8222673.pdfIn PDF document text
    • https://vesodebeso.weebly.com/uploads/1/3/4/3/134314426/f3e8b99a.pdfIn PDF document text
    • https://vuligezu.weebly.com/uploads/1/3/5/3/135391643/wuwifedad.pdfIn PDF document text
    • https://vufedevaloto.weebly.com/uploads/1/3/4/3/134376529/zedevominawalipiro.pdfIn PDF document text
    • https://nifosigi.weebly.com/uploads/1/3/4/4/134488788/nubekebajel.pdfIn PDF document text
    • https://lonopowixeza.weebly.com/uploads/1/3/4/6/134620564/xusop-vuzis-penixinotoli.pdfIn PDF document text
    • https://vumazilizulorap.weebly.com/uploads/1/3/5/3/135300666/sezabujosose.pdfIn PDF document text
    • https://karoxenerom.weebly.com/uploads/1/3/0/7/130739074/kamev_kutexus_nodibabo_xojulijura.pdfIn PDF document text
    • https://sewimumox.weebly.com/uploads/1/3/4/6/134668968/2063e350ee9ef4e.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/c6d6968b-b8bf-4336-8e07-c90a072c33de/pak_study_book_2nd_year.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83fe807d-46cf-4131-a155-a1c48d79b8c8/monster_shark_2020_movie_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51cf9dac-1680-4d16-abba-22900985c20a/pokemon_japanese_tcg_price_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e948833b-ad4d-48b6-9d73-61e546855c7c/89898864317.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ada4aa0-b44c-4a96-a2fe-9d845cc83488/wenomemitolezumusosoduteb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f1df821-21f8-420e-9272-fa683928f4c6/how_to_draw_a_cartoon_girl_very_easy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ed96d1c-4f3a-4a40-85f0-bcce91d2746e/sun_joe_spx3000_xtream.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_off0000f63e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63E 5516 bytes
SHA-256: e5d05696bf10aecb0cdd1a8c8d7a5971cb1027c14be72b299c66ad7c52e0ee53
font_01_sfnt_off0001091b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1091B 11508 bytes
SHA-256: 9f3f7fba282d343c2ca7e11028700e21158319eeb22815f210f52921e93c1f7f

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