Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad2f79444805f2ef…

MALICIOUS

PDF

73.5 KB Created: 2021-03-19 10:47:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: ad1160a2dc80c5af09028db1cdfcb856 SHA-1: 2e4511af23e8eb341ac0976ba6575f49e7c607d5 SHA-256: ad2f79444805f2efd17d7abc3027fe7e992c9a519a9ed69ca453b0e89905edd6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://botokaw.ru/award?keyword=document+to+pdf+converter+free+download+full+version PDF link annotation
    • http://copyrighthelpptteam.com/what_is_the_best_convection_air_fryer_toaster_oven8ezuu.pdfIn PDF document text
    • https://vexakoloninabi.weebly.com/uploads/1/3/4/8/134851928/xagilepu.pdfIn PDF document text
    • http://form-lnstagramverificationbadge.com/manazofogovu2hgby.pdfIn PDF document text
    • http://minomesiguziv.22web.org/xodipurepu.pdfIn PDF document text
    • https://tipuvativojodud.weebly.com/uploads/1/3/4/7/134754547/sabifo.pdfIn PDF document text
    • http://ch-bewertung-2888.xyz/derecho_procesal_del_trabajo_nestor_de_buen0v2hk.pdfIn PDF document text
    • http://zigijel.22web.org/diary_of_wimpy_kid_rodrick_rules_soundtrack.pdfIn PDF document text
    • https://kilosite.weebly.com/uploads/1/3/0/7/130739696/lereles.pdfIn PDF document text
    • https://juduloto.weebly.com/uploads/1/3/5/3/135323899/95ea8.pdfIn PDF document text
    • http://shop-you.xyz/shadows_of_the_mind_roger_penrose0y1ds.pdfIn PDF document text
    • http://ttop-shop.com/what_is_the_difference_between_taurus_g2c_and_g2sai28f.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/lupuvogotog/a_train_dacoity_report.pdfIn PDF document text
    • http://duxuramubot.epizy.com/sum_of_arithmetic_sequence_worksheet.pdfIn PDF document text
    • https://13a7c488-548c-4b48-b567-d2b0b9a3e1de.filesusr.com/ugd/85d67f_0ca856cc30a04273b85721d0f8d9e072.pdf?index=trueIn PDF document text
    • http://xekipeme.rf.gd/emergency_denis_johnson_audio.pdfIn PDF document text
    • http://xetojawik.epizy.com/37414612206.pdfIn PDF document text
    • https://67dc9804-4028-4298-afd7-d431d2c16fe6.filesusr.com/ugd/559c84_a9a9a9eaa9e44abfad92894a284ecced.pdf?index=trueIn PDF document text
    • http://menogarelaxij.rf.gd/temperamentos_transformados_libro.pdfIn PDF document text
    • https://s3.amazonaws.com/xukirizugukugi/84977591971.pdfIn PDF document text
    • http://mirivukavezigo.epizy.com/wodazuwojig.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_off0000e1f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1F4 5452 bytes
SHA-256: 23ef3d8c91ad466a6ee1d16349885af96aab7e7f0f1094f1518cfc1c9a62b248
font_01_sfnt_off0000f486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF486 10420 bytes
SHA-256: 10f92bd22a21fc5f32edaea974f09300433f14de384fa42e060a2db05590bbe2

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