Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a32798f02b216e5…

MALICIOUS

PDF

78.3 KB Created: 2021-03-19 10:56:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4444697f9dfe20f984c3647fd7aaa2b9 SHA-1: d94b314c026818890007f5728d398763c90b4cef SHA-256: 9a32798f02b216e57e30b4562dfc9eb4198ca05fb217ef14624a440ef6bfc1fa
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains, indicating a link farm or SEO spam campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://botokaw.ru/award?keyword=bengali+calendar+1426+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4462714/normal_600561ad220bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371536/normal_604ec27bb4e60.pdfIn PDF document text
    • http://naturwow.space/180727946583l14k.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467564/normal_5ff40b10460b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416154/normal_5fdc1b0883271.pdfIn PDF document text
    • http://yewes.space/singer_503a_for_sale88ypa.pdfIn PDF document text
    • http://dkblogin-de.best/1160666211oxxs0.pdfIn PDF document text
    • http://texoraw.sportsontheweb.net/benim_hocam_fizik_tyt.pdfIn PDF document text
    • http://1xbets-reg.site/kalejekudlw9nh.pdfIn PDF document text
    • http://mirijesuwakug.sportsontheweb.net/kevedidubexuwurojus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368976/normal_6033920d63636.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://ef91f683-d150-451a-afa2-e6a68a35de23.filesusr.com/ugd/c4f63d_05ec0982fa754063bd5e2d0cf64e6e46.pdf?index=trueIn PDF document text
    • http://wixudilasajigil.rf.gd/23236037424.pdfIn PDF document text
    • https://5053e88e-9e18-4719-890c-32a1cca0295d.filesusr.com/ugd/411503_c340d6a49fb44f30bdbb891b6c7d8fcb.pdf?index=trueIn PDF document text
    • http://selumaruba.epizy.com/68148617091.pdfIn PDF document text
    • https://7a3463bf-3117-47cc-940f-ad9d50d05675.filesusr.com/ugd/9f2514_9aacc56ee015434eb4c2ebfb024bbe21.pdf?index=trueIn PDF document text
    • https://46c0acaa-de7d-4f46-84f0-c2cf1d8ff7d9.filesusr.com/ugd/ac1638_62c813f5598b493cad4ad4d47a7d55df.pdf?index=trueIn PDF document text
    • https://356bbf58-84af-4bff-99a9-d03346e46411.filesusr.com/ugd/b5472a_99afef7470a64dca9b8be0d61a2ec8d0.pdf?index=trueIn PDF document text
    • https://391e4f24-9fc9-4707-ac06-338edcd9f959.filesusr.com/ugd/110ef3_eb79b3d0015a4ebbbc1df5fed751fd3f.pdf?index=trueIn PDF document text
    • https://6c473ef0-402e-45f0-9f95-6bc7e89a6a1a.filesusr.com/ugd/5518c3_ec08a27ea94b45fdaacb988ffa51c8ab.pdf?index=trueIn PDF document text
    • https://03df18d0-0a94-4077-8b44-1f3cf8b7c870.filesusr.com/ugd/23a6c3_a7b54e68691847a8b63f8435aed2a74b.pdf?index=trueIn PDF document text
    • https://e082cb0d-9c22-4a21-acb7-e2c6127a51d3.filesusr.com/ugd/ff0c06_291d408fe5794d0eb96a5f622a31387e.pdf?index=trueIn PDF document text
    • http://pitupeg.epizy.com/transylvanian_sunrise_cz.pdfIn PDF document text
    • https://d6ac5066-27fc-4e71-a07d-b30af50dfe8b.filesusr.com/ugd/934fc3_6532fecf10ba470cb57a42a22615a4d5.pdf?index=trueIn 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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC42 5220 bytes
SHA-256: 8dd00f2c5dba205861a74e32253794ec42eba164ecec9fa6e91e2865e66e9825
font_01_sfnt_off0000ee08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE08 4140 bytes
SHA-256: b7882c459d94d9fb05ee491b72d0ee9c35e8d4bc9ed5787c7a0b3ba78fd6bc86
font_02_sfnt_off0000fb2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2F 9988 bytes
SHA-256: 11b0198c23e2432cf8cb39e88c458e149c52dce26dbe3516af186af1fe1ca02b
font_03_sfnt_off00011d66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D66 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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