Malicious PDF — malware analysis report

Static analysis result for SHA-256 70a11f1a15564645…

MALICIOUS

PDF

86.2 KB Created: 2021-05-07 01:46:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8626bfde0d60f5b288facd1b8240c138 SHA-1: 53506d2e63d66f6c605744748f856f68143f51ee SHA-256: 70a11f1a15564645d9da48707ff766bc7895e0254bb4856a240adde5661e2f4e
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 0.9991

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://jumiwimov.ru/strik?utm_term=how+do+you+say+jeet+kune+do PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4480393/normal_5fd64881882c3.pdfIn PDF document text
    • https://nugivukowunel.weebly.com/uploads/1/3/4/0/134041243/c01d454.pdfIn PDF document text
    • http://nokiwurugibub.mypressonline.com/tecnicas_de_dibujo_arquitectonico.pdfIn PDF document text
    • https://pelabinal.weebly.com/uploads/1/3/1/3/131379552/632027.pdfIn PDF document text
    • http://neip-forum.fun/how_long_to_cook_a_turkey_in_an_electric_fryertpb2o.pdfIn PDF document text
    • https://ramoxibe.weebly.com/uploads/1/3/1/6/131636726/f938edf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500679/normal_5fe7a2d572226.pdfIn PDF document text
    • https://nawexolaka.weebly.com/uploads/1/3/4/7/134704757/wumoduj_sipojigexokeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390381/normal_606b99f4587dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460255/normal_603305edbc848.pdfIn PDF document text
    • http://kmplitka.shop/625308580220z5y.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419820/normal_5fe15f1bc03fd.pdfIn PDF document text
    • http://rebibedo.mywebcommunity.org/mikedaxesi.pdfIn PDF document text
    • https://nabatiniwoz.weebly.com/uploads/1/3/4/8/134889778/5e991.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://71da2aa5-51c3-4f2c-ab18-08bbbad20131.filesusr.com/ugd/d216cb_d0dd995abc4c4486849f7668ca648ab9.pdf?index=trueIn PDF document text
    • https://f61a8d15-835b-4c36-a3db-e4ead73ab13f.filesusr.com/ugd/e9f5f3_14acf743eabe45748da33f168ffc484a.pdf?index=trueIn PDF document text
    • https://68f06c25-eb64-4e0a-94e3-a0e33e610147.filesusr.com/ugd/463ace_b88a42f98c2f4a5d839b1be01f037a14.pdf?index=trueIn PDF document text
    • https://85fc0914-20e3-4f1c-be8c-de7e6f89f47e.filesusr.com/ugd/a44510_f68547e9446047758d5c596d3d247237.pdf?index=trueIn PDF document text
    • https://1e16f6d7-285b-4488-bf07-d3e24ac90e20.filesusr.com/ugd/417718_3a1947ffc4af40a1b6fa64895c74b59a.pdf?index=trueIn PDF document text
    • http://fojosotum.myartsonline.com/likopujubokututexune.pdfIn PDF document text
    • http://rorazizaxaf.atwebpages.com/fexokivuja.pdfIn PDF document text
    • https://679cd94f-bb1f-411a-9684-d99498fe93d6.filesusr.com/ugd/ce16d4_ec80cee417cd47948dd30ac498af037b.pdf?index=trueIn PDF document text
    • https://61090d85-22e6-4724-b969-52a17785150c.filesusr.com/ugd/952c2e_f114dcdc584749e786b2fa754776c153.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD4 4732 bytes
SHA-256: 802c37598a0fb4eee6195a489825a6c02fc6515993be80a52b0d73f2cd96726e
font_01_sfnt_off00011041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11041 4984 bytes
SHA-256: e0ece8c0afb41757dcc8970f6c13f1da5a07b2e7dc3e6d0020644a64d5d9f43b
font_02_sfnt_off00012164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12164 12220 bytes
SHA-256: f820d6737bdb696700edc712723f2e265c0a20da1c79e7775aeb29c45239c5cb