Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbbc058a4ed5319a…

MALICIOUS

PDF

75.1 KB Created: 2021-04-26 02:59:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: f47eafbcd75c2e318d06065444a36de8 SHA-1: d6575bfb7cefc630ec92a652756f0fa09ce5eda5 SHA-256: bbbc058a4ed5319a16634a8a8c5b24b0f68af3f4f07cfd4887c61f475537ec9d
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, which is characteristic of link farm or SEO manipulation tactics. ClamAV detected this as Pdf.Phishing.Trojan, and ML classification strongly indicated maliciousness. The presence of external URIs and the link farm heuristic suggest the primary goal is to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dugedepap.ru/strik?utm_term=what+are+the+different+types+of+functions+in+python PDF link annotation
    • http://usesalle.xyz/what_does_it_mean_when_your_emerson_tv_wont_turn_ondb7gl.pdfIn PDF document text
    • https://jebadufe.weebly.com/uploads/1/3/3/9/133997269/2396564a.pdfIn PDF document text
    • http://pankreatitum.ru/30434979055n05y2.pdfIn PDF document text
    • https://xetupowo.weebly.com/uploads/1/3/1/3/131382232/sijiwadeviboboted.pdfIn PDF document text
    • https://falototadapi.weebly.com/uploads/1/3/3/9/133989324/25c9ff7.pdfIn PDF document text
    • http://reactivaperu-viabcpi.com/wuwosepobixomerxm8sp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459054/normal_6003c6a77413f.pdfIn PDF document text
    • http://workbykoder.xyz/avengers_endgame_full_movie_free_youtubevc5rz.pdfIn PDF document text
    • https://rovepegolotiru.weebly.com/uploads/1/3/4/3/134319415/5649596.pdfIn PDF document text
    • https://bevabuje.weebly.com/uploads/1/3/4/8/134897483/3943799.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380525/normal_5ff0d2e61633d.pdfIn PDF document text
    • https://refapezi.weebly.com/uploads/1/3/4/9/134904673/1927655.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458417/normal_6036cc61d83e4.pdfIn PDF document text
    • http://natorg.fun/citroen_c3_picasso_workshop_manualwxltf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://907864b8-ab38-4b43-b195-7646ee37c451.filesusr.com/ugd/c4b402_2f410f436d174d36a4e91558ecc08f2d.pdf?index=trueIn PDF document text
    • https://69df74eb-9f83-488d-97bb-abb55063df61.filesusr.com/ugd/f34323_afb7563bfed64798bc1ff9bb532e4cbd.pdf?index=trueIn PDF document text
    • https://eb40363d-1d1f-4170-a897-f23f0f433116.filesusr.com/ugd/2a1429_70792c5eb7df43cbb419319033b868fa.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sobaketemu/59872740807.pdfIn PDF document text
    • https://s3.amazonaws.com/jaxesabi/dinafepurulew.pdfIn PDF document text
    • https://5f1c1209-45f6-45c0-988a-e0aaa04be055.filesusr.com/ugd/ba5820_74689b55d0e34a92b785decfde0401c8.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_off0000e655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE655 5324 bytes
SHA-256: 99e605440622553023fdcd37eb2f73a66d3a47e0459790f3881c4daf3fd73e06
font_01_sfnt_off0000f886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF886 10960 bytes
SHA-256: 7a7ee685f25617571b43dea7ce717c1c8446dace26ea00a22bf98e8077fd67df

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