Malicious PDF — malware analysis report

Static analysis result for SHA-256 671e65758ee6b9a7…

MALICIOUS

PDF

74.7 KB Created: 2021-04-02 12:00:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 69a99da54f247b296a3e8e9ac7e2c0b2 SHA-1: b433bb204872ef031ee94cf38992431220b837a4 SHA-256: 671e65758ee6b9a7f561d3439416a50cc21824923a6262107184a25142497aee
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on disposable domains, indicating a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to malicious content.

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://xajibur.ru/strik?utm_term=john+deere+lx277+48c+mower+deck+belt+diagram PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4408482/normal_5fdee42974d84.pdfIn PDF document text
    • https://cdn.sqhk.co/liralimujote/LAiiqdw/diy_beetlejuice_costume_female.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479446/normal_60253ed8a9de8.pdfIn PDF document text
    • http://migipobazu.mypressonline.com/67857618727.pdfIn PDF document text
    • https://cdn.sqhk.co/wimakebibane/EzsKIge/clean_incubus_lyrics_meaning.pdfIn PDF document text
    • https://cdn.sqhk.co/purorenutuw/e4hajfV/fasusumegumatujudoxid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366982/normal_601a053d7fb61.pdfIn PDF document text
    • http://tefuvawilutir.mypressonline.com/52363412795.pdfIn PDF document text
    • https://cdn.sqhk.co/vegupujed/6o6IryK/xudirugakaxokavop.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7e6b698e-d56f-4a21-8c48-787e2f6d39f4.filesusr.com/ugd/7836c9_df66e0546dbe4de8ac99dd4dec756a60.pdf?index=trueIn PDF document text
    • http://jowokepo.atwebpages.com/abnormal_psychology_kring.pdfIn PDF document text
    • https://65d0a56f-4074-4e8f-9acc-29e6f8e8f663.filesusr.com/ugd/37655d_225d2e1ec6564f779e764263ee70f201.pdf?index=trueIn PDF document text
    • https://1f49b3f1-4b09-4f89-88df-03804352fc9a.filesusr.com/ugd/a51aec_f387ddd67bf349deb3ef5d2412c2e67f.pdf?index=trueIn PDF document text
    • https://18d8f76e-0bdd-4b96-b744-fee987eed1b0.filesusr.com/ugd/1486c8_1eb86beaa8914c52a75ef8fc30d66830.pdf?index=trueIn PDF document text
    • https://2ddc7431-ff91-46e9-9708-195efd6cc195.filesusr.com/ugd/ffe0d3_18f6dba4e6dc485cb78b113d4efe6f46.pdf?index=trueIn PDF document text
    • https://52aa71f3-9574-4e96-898b-bb16aa893b2c.filesusr.com/ugd/b13a71_a04caf0b06ea4445a08cbcdaa1afa459.pdf?index=trueIn PDF document text
    • https://c0771fee-1ba5-4dbf-bba5-a775c3d44c03.filesusr.com/ugd/544e7e_446ba8aff14d4099b24992f56da858bd.pdf?index=trueIn PDF document text
    • https://17851959-1482-4b49-8222-7b7b0c628459.filesusr.com/ugd/3cb679_419eec3d148b4e84b0f997a09dff66fd.pdf?index=trueIn PDF document text
    • https://32b33340-d9da-4ef7-b3bd-a0ac5134eb71.filesusr.com/ugd/adfa6f_0413c7107f7045b6bb079184a5afb383.pdf?index=trueIn PDF document text
    • https://a819be37-316e-4347-83bc-b067fb6953c8.filesusr.com/ugd/d5662a_b8ef143b098949daad1301b1a93a97d8.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_off0000e41b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE41B 6024 bytes
SHA-256: bbe9d6fa76f87f8c63cf21d6fcb745a32c3786fdefdf8ea5f1cc9628ee4761aa
font_01_sfnt_off0000f88c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88C 10772 bytes
SHA-256: 9c7ad524b10b811afd049eb49c08a00749b0b97af26d153dc0eb6d9df1cb856e