Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed2b08368f6271b4…

MALICIOUS

PDF

138.4 KB Created: 2021-03-29 10:54:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 040c531a6ff5bc511be03126f6f9203a SHA-1: 72dc564363e2c9359aef76a8672e01845b57b8cb SHA-256: ed2b08368f6271b45a81ff123616922df5aa691717d5d3e784166c70d324301d
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 are dynamically generated, indicating a link farm or SEO spam tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as Pdf.Phishing.Trojan. The embedded URLs, such as 'https://zajinet.ru/wix?keyword=oraci%25C3%25B3n+a+san+judas+tadeo+para+el+trabajo', are likely used to distribute further malicious content or lead users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/wix?keyword=oraci%25C3%25B3n+a+san+judas+tadeo+para+el+trabajo
    • https://bimidupixujeg.weebly.com/uploads/1/3/4/3/134319160/ximikajel_juzawep_kovazemazez_fixakikimu.pdf
    • http://mupoxebetofe.iblogger.org/the_risk_of_incorrect_acceptance_and_the_risk_of_overreliance_relate_to_the.pdf
    • https://mumojugaweweran.weebly.com/uploads/1/3/1/0/131070520/tedegikusap_wozijikupe_bopufelekeb.pdf
    • https://rawoxozuk.weebly.com/uploads/1/3/2/6/132695352/tawovitigulok.pdf
    • https://lisudite.weebly.com/uploads/1/3/2/6/132682892/481926.pdf
    • https://guxovixig.weebly.com/uploads/1/3/5/3/135317997/kubexavugatap-majuzitejizim-zarope.pdf
    • http://newobesarejif.22web.org/tutorialspoint_c_programming_download.pdf
    • http://fejoromawefobo.22web.org/52478410830.pdf
    • https://jenitexul.weebly.com/uploads/1/3/4/8/134859983/6080125.pdf
    • https://zidepodip.weebly.com/uploads/1/3/0/7/130775192/fixavoxuxo.pdf
    • http://misudijawalezom.22web.org/kavupepavininerurozufup.pdf
    • https://numesenara.weebly.com/uploads/1/3/1/0/131069843/lorupugadid.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/litunux/ritopolon.pdf
    • https://uploads.strikinglycdn.com/files/e7765d92-2672-4100-81d8-1fd8e978073f/accounting_made_simple_book_review.pdf
    • https://s3.amazonaws.com/gavexilatuvitaz/are_viruses_alive_answer_key.pdf
    • https://s3.amazonaws.com/jojitagifuva/5649720192.pdf
    • http://bamemuwibe.epizy.com/niruraval.pdf
    • https://s3.amazonaws.com/fadobirak/80579125423.pdf
    • http://panadokopejed.epizy.com/chrome_manager_mac.pdf
    • https://uploads.strikinglycdn.com/files/4956f64c-8408-4a55-b5f9-17c915521363/signs_a_shy_guy_likes_you_body_language.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001d7e3.bin
6f820ace2e2f0a99f620e45fac179c4226fff545a21fb1416f0e1e244ce4d909		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1D7E3 5448 bytes
font_01_sfnt_off0001ea2b.bin
ad5685ad4259ae0e7e0a0d5bc84c1c188d5486c652b89a4ac8586127ba7ccfbb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1EA2B 15040 bytes

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