Malicious PDF — malware analysis report

Static analysis result for SHA-256 d688184794bea1dc…

MALICIOUS

PDF

78.1 KB Created: 2021-04-03 22:34:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 11c3d41b45b96f39e84ad9b92d719db8 SHA-1: 27d218800c707343178461da20c4966929a084eb SHA-256: d688184794bea1dcc126951903235ec52b4e0a6d0cb84f75ffb39122b3d89e55
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The primary URL, https://nipisod.ru/strik?utm_term=calories+in+dunkin+donuts+low+fat+blueberry+muffin, is likely used to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://nipisod.ru/strik?utm_term=calories+in+dunkin+donuts+low+fat+blueberry+muffin PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446923/normal_5fea188038ddb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501027/normal_601b1e7da5026.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479710/normal_6065753e56add.pdfIn PDF document text
    • http://ighelpcenter.xyz/82496149217hpp5n.pdfIn PDF document text
    • https://zubikuzo.weebly.com/uploads/1/3/1/4/131453486/xutukukanebafi.pdfIn PDF document text
    • https://bubebozozuj.weebly.com/uploads/1/3/1/8/131871643/wozodelaluxewo_fujakajabemo_tegigowerubab_dubutogu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459916/normal_602a0b3c53818.pdfIn PDF document text
    • https://tazerodine.weebly.com/uploads/1/3/4/5/134598813/fikekezif.pdfIn PDF document text
    • https://rimozaruminipa.weebly.com/uploads/1/3/5/3/135391391/4063b2.pdfIn PDF document text
    • http://stickerrus.ru/how_to_test_for_ac_leak_in_car4xf05.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382960/normal_5feb7e70ee24a.pdfIn PDF document text
    • http://passive-income.ru/monalixuronibonasifugozat9uc9k.pdfIn PDF document text
    • https://jejipabiximi.weebly.com/uploads/1/3/2/7/132741556/sipotejaradolimogi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377407/normal_6002c3e7405e2.pdfIn PDF document text
    • http://copyrightmediahelp.com/30687720046s5i0z.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369499/normal_6064e640deff7.pdfIn PDF document text
    • http://comp-arenda.site/23355865239r7kdb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368746/normal_60506dd2d437a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453328/normal_60466f6512877.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://1a2149e7-ca7f-4e7c-a584-0e483de6f3af.filesusr.com/ugd/9219f8_b070bfd070704886a3766d709dd9ac18.pdf?index=trueIn PDF document text
    • https://673fcb93-492a-40d1-a7cc-77260b5c7816.filesusr.com/ugd/62d21a_b3262bddb46f40a5bdd9ac3d8fc2e87b.pdf?index=trueIn PDF document text
    • https://9df6fdd8-df71-43fb-87ad-b121b2de7416.filesusr.com/ugd/e0d0cf_c8baeb735a204fb790d20de3dfa0935c.pdf?index=trueIn PDF document text
    • https://6d8b2927-5c4d-40df-b593-c6bd35e19528.filesusr.com/ugd/1adac8_aca72b79aaf44bd59db43b7b2b28256d.pdf?index=trueIn PDF document text
    • https://fec450ea-b80f-4746-b851-35139cc02de5.filesusr.com/ugd/53a83b_8b4a4c18fa52494e89f3fdb36a8899a5.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_off0000e56c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE56C 5356 bytes
SHA-256: 8ed738d3389bc829a7d42b04c259d68d3329c7c52eb6b487d4e5bf2c24178782
font_01_sfnt_off0000f7a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A3 10760 bytes
SHA-256: fe1927dbf9852ca59e9a452b4c7628b45cec8bd00d7355deaf7e4028f831f699
font_02_sfnt_off00011c88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C88 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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