Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f8f47ed11859488…

MALICIOUS

PDF

78.5 KB Created: 2021-03-31 02:20:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: a78a20fdf856fe391e0991f494f91af8 SHA-1: b13da56438e08845ec7b44030d2d3730c33b59bb SHA-256: 0f8f47ed11859488a236bcbc8783a695d7afddba46344b64f7052209eda6202b
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are part of a link farm designed to manipulate search engine results. The primary URL, 'https://jottigo.ru/award?keyword=acidosis+metabolica+compensada+pdf', suggests a lure related to medical information. While no scripts were explicitly extracted, the 'PDF_SEO_LINK_FARM' heuristic and the high ML classifier score indicate a malicious intent to redirect users to potentially harmful content, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • 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://jottigo.ru/award?keyword=acidosis+metabolica+compensada+pdf PDF link annotation
    • http://paksorond.xyz/not_abolishing_the_death_penalty6cdu5.pdfIn PDF document text
    • http://begetus11ppz.xyz/25411595452k6pky.pdfIn PDF document text
    • http://matrixbicycles.com/fizuguvafoxibafoviwikeb8wcua.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bomupi/minosenirawisejitive.pdfIn PDF document text
    • https://s3.amazonaws.com/gopuze/wodizesewiwovevogin.pdfIn PDF document text
    • https://e0220c8c-c322-4c33-af83-7c5b0fe00b66.filesusr.com/ugd/a771bd_477c7c2faa734003892d79878d451352.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/benubapopikaj/45803909586.pdfIn PDF document text
    • https://9ef77391-fdd1-48d8-ba15-364b07375333.filesusr.com/ugd/ebefdf_ea22cd34e969425994ac704bc0c046dc.pdf?index=trueIn PDF document text
    • https://6d8b2927-5c4d-40df-b593-c6bd35e19528.filesusr.com/ugd/1adac8_474f386edac04518a3d09c70983d7cb3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fixararololu/vefenorewugozub.pdfIn PDF document text
    • https://s3.amazonaws.com/daniwodug/xuruw.pdfIn PDF document text
    • https://s3.amazonaws.com/kuxuxemu/948758764.pdfIn PDF document text
    • https://s3.amazonaws.com/zuwosil/what_does_a_raven_mean.pdfIn PDF document text
    • https://s3.amazonaws.com/resabomibogodaw/pizowinugikasabole.pdfIn PDF document text
    • https://fad58b31-c538-4d3f-828d-7998eec853b9.filesusr.com/ugd/7e6083_7d3d3c5aaeed4e3f82c4310530551132.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mikibetiv/tested_advertising_methods_by_john_caples.pdfIn PDF document text
    • https://s3.amazonaws.com/leteraxewe/ariston_hotpoint_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/muwomapotumugi/79565485508.pdfIn PDF document text
    • https://b2fc43c4-60ab-4dc1-a1c8-84833fda4e2a.filesusr.com/ugd/37321e_0fe0976591ee45bc9ba6b3c3eddfb3cf.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mesixadelomomo/67500370251.pdfIn PDF document text
    • https://s3.amazonaws.com/wesezuzuvalirik/44593047016.pdfIn PDF document text
    • https://s3.amazonaws.com/defujo/c_language_for_windows_10.pdfIn PDF document text
    • https://99516632-72ce-40f3-a9a1-a01c91361c65.filesusr.com/ugd/e42c35_63e57fa1494d45c791cc1655497f025a.pdf?index=trueIn PDF document text
    • https://3bdad275-8828-414d-9063-9532e035d791.filesusr.com/ugd/c67d0c_a8d2c1365e644454b5532b5c1bc58b12.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_off0000ef93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF93 5332 bytes
SHA-256: 255c3f67c7bc6876a326e86e8f61cc84bd379834185fa6e89f793f0842911846
font_01_sfnt_off000101a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A1 12432 bytes
SHA-256: e70c0f551d9fc633ef817da59efc641c6458ae7f5c264e0cfc8532ed7e70f4bc

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