Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdadfdcd856c0674…

MALICIOUS

PDF

114.6 KB Created: 2021-03-16 17:03:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 39166f34691ae22f177218969316f8cf SHA-1: 45b43ab2010ad892c0247c17d21b7bc461a3ca7b SHA-256: bdadfdcd856c0674c2353520f4a6926fa8e448073bf4a0a38543e89c8b2c674d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDFs, suggesting a link farm or SEO abuse tactic. One critical heuristic identified this as a "Pdf.Phishing.Trojan" and an ML classifier also flagged it as malicious. The primary malicious URL identified is https://xajibur.ru/wix?keyword=critical+mass+communication+theory, which is likely used to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • 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/wix?keyword=critical+mass+communication+theory PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4365621/normal_6005d7022d09d.pdfIn PDF document text
    • http://feseburowikuted.22web.org/1984_part_3_chapter_5_questions_and_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409413/normal_600a1654cf07e.pdfIn PDF document text
    • https://zopokobo.weebly.com/uploads/1/3/1/3/131383813/9155697.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468827/normal_6044a002c67af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410953/normal_601c5e4f2408b.pdfIn PDF document text
    • https://duxosemizosew.weebly.com/uploads/1/3/4/7/134763313/memaneledivuluv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451352/normal_60225496b21cf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414161/normal_5feb6db5eb9bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473637/normal_6039cb266d220.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485939/normal_5ff57b614de3a.pdfIn PDF document text
    • https://gonedosi.weebly.com/uploads/1/3/4/7/134730609/efe2fc798.pdfIn PDF document text
    • https://towizitubozabo.weebly.com/uploads/1/3/5/4/135400713/nipogimesiputixik.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://s3.amazonaws.com/jepinebawo/29534184347.pdfIn PDF document text
    • https://s3.amazonaws.com/kujapomib/15701385137.pdfIn PDF document text
    • https://s3.amazonaws.com/wokesabisevo/gikib.pdfIn PDF document text
    • https://d7b50aa0-fea3-4edc-ba9e-4ed0094b0c60.filesusr.com/ugd/7f614e_01de854673224455ac7f496b235f56c3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/satulibaren/create_a_browser_android_studio.pdfIn PDF document text
    • http://naxokagad.epizy.com/wamigenavi.pdfIn PDF document text
    • https://8bd0dbf5-62e0-4684-a95a-1d9666dfa34a.filesusr.com/ugd/e71694_c206cac776bf488a8b4dc8ba31f563d6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pirosisob/vedunutalovoxunuwewep.pdfIn PDF document text
    • http://jemumanapumaze.epizy.com/29128261097.pdfIn 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_off000173fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173FB 5044 bytes
SHA-256: 38841d760cde90b54a33538655c7b221279e0cdabd2ffd461770f924b30afb0f
font_01_sfnt_off000184f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x184F2 11812 bytes
SHA-256: fe910d0a8e59a3f69d3203f941bbd7e5fd0054beead60f91574e5cd6b4187bac
font_02_sfnt_off0001ac54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC54 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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