Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8a05b2dd6e6e301…

MALICIOUS

PDF

73.6 KB Created: 2021-03-01 14:51:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: a45d781eca26159e15a59de367cf4dc7 SHA-1: 8c09433f3c82e4b1de63dca8e547a63693eedff5 SHA-256: f8a05b2dd6e6e301713a49ee9c20a7a372f0ca314e3b416a6ccbfc861832d23c
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable hosting and redirectors, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to direct users to malicious websites for credential harvesting or malware distribution. No scripts were extracted, but the PDF structure itself is used to host the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=how+to+change+oil+husqvarna+riding+mower In PDF document text
    • https://jutoxanifi.weebly.com/uploads/1/3/5/3/135321179/8550919.pdfIn PDF document text
    • http://saburogamo.iblogger.org/cfop_method_algorithms.pdfIn PDF document text
    • http://befigter.xyz/29882780170zf084.pdfIn PDF document text
    • https://kurupatasewa.weebly.com/uploads/1/3/5/9/135958836/4160839.pdfIn PDF document text
    • https://cdn.sqhk.co/lepavenujal/icV3Y5L/cnc_lathe_machinist_jobs_near_me.pdfIn PDF document text
    • http://dsv-trening.ru/boss_movie_telugu_songs_freevqpip.pdfIn PDF document text
    • https://cdn.sqhk.co/sadirorig/hhbojff/kobowofuzupunarawebugiw.pdfIn PDF document text
    • https://vexepagofebove.weebly.com/uploads/1/3/4/8/134866030/4571725.pdfIn PDF document text
    • https://nuvaxavixo.weebly.com/uploads/1/3/0/7/130738964/151df.pdfIn PDF document text
    • https://zemijawa.weebly.com/uploads/1/3/1/0/131070152/ce4aa6f.pdfIn PDF document text
    • https://fodubimofo.weebly.com/uploads/1/3/4/8/134884763/vukixatapuwiweloga.pdfIn PDF document text
    • http://fujubipe.22web.org/canada_food_guide_2018_baby.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wadumoseri.rf.gd/73898029247.pdfIn PDF document text
    • http://laxiruzeremifam.rf.gd/81166321902.pdfIn PDF document text
    • http://lojojijozopixaz.epizy.com/how_to_write_a_script_for_a_presentation_examples.pdfIn PDF document text
    • http://favavobebin.epizy.com/bepobitizasa.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE010 5592 bytes
SHA-256: 8e660bdebb05479637a40be94f0f12862af0bb18164c14be7561ee24dc2e7b9d
font_01_sfnt_off0000f2f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F9 10844 bytes
SHA-256: 5111379fbd79805e40738d4e7bd8029bbf4fb2175ab8dcdd0fcd04a3720b67d5

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