Malicious PDF — malware analysis report

Static analysis result for SHA-256 5821bc42c94788c7…

MALICIOUS

PDF

77.0 KB Created: 2021-04-05 00:29:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 3053deedf4d012deb96edf8526c45a02 SHA-1: 47c0cb51a9fb4894e1e90ef9c33a831425d37e6f SHA-256: 5821bc42c94788c75b4c3952d946f401dddfe6abcca24730175f15815545532d
186 Risk Score

Malware Insights

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

The PDF document contains a mass of external links, many pointing to disposable hosting, and is identified as a link farm. The primary lure appears to be a 'diet plan to lose weight' which redirects to a URL that likely serves a malicious payload or leads to a phishing site. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jottigo.ru/strik?utm_term=diet+plan+to+lose+weight PDF link annotation
    • http://zogeditel.iblogger.org/9702561686.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471085/normal_602c949a98360.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390663/normal_60272c4e78022.pdfIn PDF document text
    • https://ruxikikigiligex.weebly.com/uploads/1/3/4/3/134347308/4ddf48f951436.pdfIn PDF document text
    • https://vomizovuzib.weebly.com/uploads/1/3/1/6/131637161/tivibijat.pdfIn PDF document text
    • https://cdn.sqhk.co/kataregulu/aSlggig/jafusoto.pdfIn PDF document text
    • https://madajeguruxe.weebly.com/uploads/1/3/4/3/134348767/nemonarinivo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420230/normal_5fd11afdd2d20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489852/normal_604b75b5f12ac.pdfIn PDF document text
    • https://cdn.sqhk.co/rawerusiwala/Cjc2iOC/2596645286.pdfIn PDF document text
    • https://gakujoxabusu.weebly.com/uploads/1/3/5/3/135394689/takatide-rinisizaf-fujabudogami-damagumo.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/yziikgg/lutejufe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9e1e9198-0fe7-4103-8084-fdcc6befb8d5.filesusr.com/ugd/2f7815_bfcec6c693144f8d9b644f581146e7fd.pdf?index=trueIn PDF document text
    • https://580b68e3-2104-4118-ae5b-4f285de1c062.filesusr.com/ugd/dad7b5_c0a00b9ceaf54ebeb773bfe219a32cef.pdf?index=trueIn PDF document text
    • http://pixuxurarosu.epizy.com/oreo_adaptive_icons_apk.pdfIn PDF document text
    • https://081e7fb2-604d-424b-9b75-a58d54a71a44.filesusr.com/ugd/abd6ea_f44d795084a848128d20e749cde46143.pdf?index=trueIn PDF document text
    • https://2df7536a-ab64-4dd3-a6ca-98e0eca144a4.filesusr.com/ugd/de578f_ccebec07351f4930a3ea5efce10d1e30.pdf?index=trueIn PDF document text
    • https://7fc1e5b2-1dd8-4457-9de2-3dea1ab9f589.filesusr.com/ugd/fedd61_c7ce9cda0c4c46f2a85ba28e58ec471e.pdf?index=trueIn PDF document text
    • https://5de6e22f-064f-4859-b003-4eaa502c5056.filesusr.com/ugd/2609e6_58046f07346c4650bfb8b6d9484d11de.pdf?index=trueIn PDF document text
    • https://a91873a8-1f5b-4151-915d-af39eb211f25.filesusr.com/ugd/3f80ec_e8eb8290e4734c33b753f23d7d06f029.pdf?index=trueIn PDF document text
    • https://945b3f91-9c76-4178-be32-f0dab3cfe2c6.filesusr.com/ugd/8d5d69_cba8ca552b0b46d89b5a200b58fdab2a.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C0 5076 bytes
SHA-256: 1e46f2f7a24cc77e4e87f712fcfea5ce13bc29ab923554ce88dec3fca4c51645
font_01_sfnt_off0001021e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021E 10748 bytes
SHA-256: 97b636c1e646dda842a72376f51f99f449feb023854885ab16dd328c10aab074