Malicious PDF — malware analysis report

Static analysis result for SHA-256 d603538cb835f326…

MALICIOUS

PDF

74.3 KB Created: 2021-04-04 23:20:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: e4753d31075be74607a28382a433dc85 SHA-1: 78bc9391bdf10cd72681cc3a833b7fd89488d228 SHA-256: d603538cb835f326636b1fe2d621b3a855940b5d01805fb59da49356d2469892
126 Risk Score

Malware Insights

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

The PDF contains multiple external URIs, with a primary focus on 'https://zajinet.ru/award?keyword=data+structures+and+algorithms+made+easy+karumanchi+pdf', suggesting a lure to a potentially malicious site. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm on disposable hosting, reinforcing the malicious intent. ClamAV detection as 'Pdf.Phishing.Trojan' further confirms its malicious nature, likely involving phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 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://zajinet.ru/award?keyword=data+structures+and+algorithms+made+easy+karumanchi+pdf PDF link annotation
    • http://axacheat4.xyz/In PDF document text
    • https://cdn-cms.f-static.net/uploads/4412592/normal_6026cf1ea76a2.pdfIn PDF document text
    • https://cdn.sqhk.co/jawafurovif/ihJjRje/android_vs_iphone_market_share_united_states.pdfIn PDF document text
    • http://leyloften.online/fe_civil_reference_manualfga1m.pdfIn PDF document text
    • https://cdn.sqhk.co/pogadidotilu/CqgqZij/wuketej.pdfIn PDF document text
    • http://xagonezunoli.iblogger.org/55525836732.pdfIn PDF document text
    • http://medyayazilimtr.com/sobepegafekefazinipelesunj8shu.pdfIn PDF document text
    • http://volosaty100.xyz/42677137063pe5pi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495393/normal_604dec83a1fbd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426954/normal_5ff7b832d3f64.pdfIn PDF document text
    • http://megahit.space/73769883273rfxr7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448718/normal_6016f5ab83b07.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/bibejovixapis/87839324963.pdfIn PDF document text
    • https://s3.amazonaws.com/defipedibe/56140172795.pdfIn PDF document text
    • https://52cfbdcc-51c1-4e85-ba83-ad74149b4620.filesusr.com/ugd/93d431_b18ef0ae89f346209e008471e7cf56f7.pdf?index=trueIn PDF document text
    • http://fajukowopod.epizy.com/jutiboxa.pdfIn PDF document text
    • https://7162f0c1-3bb2-4775-9ad2-1e34613fb889.filesusr.com/ugd/595093_8698bf5045a34af295d62223a3919ecd.pdf?index=trueIn PDF document text
    • http://fujufojijasowek.rf.gd/which_of_the_following_is_true_regarding_state_rules_of_corporate_governance.pdfIn PDF document text
    • http://dodixuvizovov.epizy.com/what_should_a_2nd_grader_know_by_the_end_of_the_year.pdfIn PDF document text
    • https://2a4b29e6-a790-453e-81e7-e8b9caf2c27b.filesusr.com/ugd/bf0735_018ab7c83eec42e4b9bafebf3c803b12.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pusolefosex/jibudulutuk.pdfIn PDF document text
    • http://sozitemow.epizy.com/kosabosufo.pdfIn PDF document text
    • https://e41bb7a9-a35b-4578-ac27-1eab720d379a.filesusr.com/ugd/8912ce_d619ff8376fe40598d638ccf7e188dd1.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_off0000da8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8F 5732 bytes
SHA-256: 778604a5b31ba7e2724f523c4885cdf23f53ac47dde745cff400d4cfe84ef7d3
font_01_sfnt_off0000edfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFD 14208 bytes
SHA-256: 3be3d0985aba4bc15fc033b690329d9d1d3acf453699c7047bdfc0b3eae4472b

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