Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f8ce85c4c990c9f…

MALICIOUS

PDF

81.5 KB Created: 2021-05-02 10:01:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 0a6a640d4b14d265b17f5fe2e97ca99d SHA-1: 944d6c4cda4a498ddffdd0db85cf7dd867fbc2c7 SHA-256: 8f8ce85c4c990c9f012533b03fee5b9e292bce7d8315d9508c5499658ade5c50
126 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URLs, with one specifically flagged as a link farm on disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution campaign, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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://lozipotod.ru/strik?utm_term=ascii+values+binary PDF link annotation
    • http://poruzotosiku.getenjoyment.net/24365718956.pdfIn PDF document text
    • https://kezunegewekal.weebly.com/uploads/1/3/1/4/131483031/aba587bde869a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480588/normal_6033b618b1200.pdfIn PDF document text
    • http://nusowutevu.getenjoyment.net/fluticasone_salmeterol_davis.pdfIn PDF document text
    • http://rasazajafatirek.mypressonline.com/50548899704.pdfIn PDF document text
    • https://goguribepolim.weebly.com/uploads/1/3/0/7/130739596/saban_tusilaxu_jaberuzafolala_roxetobagunas.pdfIn PDF document text
    • https://vilofezilo.weebly.com/uploads/1/3/0/7/130740065/salilivewupubugose.pdfIn PDF document text
    • http://vigirorimikana.medianewsonline.com/pukuzegoguxazatokuvij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404755/normal_601ae88b7d116.pdfIn PDF document text
    • http://nenegifivujaxu.mypressonline.com/cisplatin_induced_nephrotoxicity_in_rats.pdfIn PDF document text
    • http://palubofapejuraw.mywebcommunity.org/63473510400.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459060/normal_5fe1f18828fe4.pdfIn PDF document text
    • https://kevulukopefot.weebly.com/uploads/1/3/1/4/131453006/tudapefat.pdfIn PDF document text
    • https://gamojomifelaja.weebly.com/uploads/1/3/0/7/130739258/5233935.pdfIn PDF document text
    • http://xibomupazone.mypressonline.com/business_turnaround_strategy.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/kudufigunabi/88120430911.pdfIn PDF document text
    • https://s3.amazonaws.com/waduzirader/tubapidijanom.pdfIn PDF document text
    • http://tuwutexo.onlinewebshop.net/xotawimegasej.pdfIn PDF document text
    • https://s3.amazonaws.com/bezutu/bit_web_server_apk_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jozaponi/8255390391.pdfIn PDF document text
    • https://s3.amazonaws.com/rezugekolaba/factoring_linear_expressions_worksheet_7th_grade.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_off0000edcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCF 4776 bytes
SHA-256: 8e0296a1b1e88421113e84afaff659bd32567f3e41f17663bced57903c125f41
font_01_sfnt_off0000fe0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0A 13192 bytes
SHA-256: 41ecd9efd1dc0fede665381b34280f0640d63f3b1dc25c1c90763c483d43a03f
font_02_sfnt_off00012a80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A80 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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