Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dcd7e3f722860db…

MALICIOUS

PDF

72.0 KB Created: 2021-05-13 07:56:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f817262dcf70388af5645b91d5407693 SHA-1: b0882fce5e3a859d4c7fa824d74d6e3bf8d7e7bf SHA-256: 6dcd7e3f722860db5cf192395cab028641520e6b6f62fab2db382f5147e6bfad
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to SEO-optimized PDF hosting sites, suggesting a link farm or phishing lure. The primary URL, 'https://midufefew.ru/strik?utm_term=why+isn%2527t+my+printer+printing+straight', is flagged as a redirector likely leading to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • 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 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://midufefew.ru/strik?utm_term=why+isn%2527t+my+printer+printing+straight PDF link annotation
    • https://dibasipelop.weebly.com/uploads/1/3/0/7/130738559/xorufixigum-gikulevakunax-sagediravefi.pdfIn PDF document text
    • https://cdn.sqhk.co/rebabafa/hghjdhc/baby_lullaby_lullaby_for_babies_mozart.pdfIn PDF document text
    • https://dudererojafa.weebly.com/uploads/1/3/4/3/134362298/xixigibepuxunox.pdfIn PDF document text
    • https://cdn.sqhk.co/lifudidu/35Zjhgs/south_of_the_border_rap.pdfIn PDF document text
    • https://cdn.sqhk.co/vunalogivefu/gV2zmgj/jimobi.pdfIn PDF document text
    • https://cdn.sqhk.co/nisugavu/WCsjagh/64189787258.pdfIn PDF document text
    • https://cdn.sqhk.co/vekuzajomugi/ihjifjc/anniversary_images_hd_free.pdfIn PDF document text
    • https://muboxofibadufus.weebly.com/uploads/1/3/4/3/134310828/d3d1573d1.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • http://edayafar.xyz/tibivoporegurutisademaumr.pdfIn PDF document text
    • http://drnextact.xyz/how_to_use_canon_mp21dx_calculatortttsn.pdfIn PDF document text
    • http://verefdliyvtorogo.xyz/ampere_meter_analog_2auhdx3.pdfIn PDF document text
    • https://bupuzufemu.weebly.com/uploads/1/3/1/4/131452870/fewuvaxufunepoludo.pdfIn PDF document text
    • http://dvigatel.guru/optiplex_780_drivers_windows_server_200864clu.pdfIn PDF document text
    • https://gasagegote.weebly.com/uploads/1/3/4/3/134333211/posigu.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/neporezofov/kenmore_600s_washer_troubleshooting.pdfIn PDF document text
    • https://s3.amazonaws.com/fajixe/john_deere_zero_turn_mowers_used_for_sale.pdfIn PDF document text
    • https://s3.amazonaws.com/fukepez/kiwuvapesotaxif.pdfIn PDF document text
    • https://s3.amazonaws.com/murudute/informante_clave_segun_autores.pdfIn PDF document text
    • https://s3.amazonaws.com/tibitexil/duvowetirerapuzula.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwamoxamo/sing_joyfully_william_byrd_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/zafibimutadoti/16009331633.pdfIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/gazuzorisofovakiwipil.pdfIn PDF document text
    • https://s3.amazonaws.com/zazelujeju/50913291927.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_off0000d080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD080 5028 bytes
SHA-256: 1518ee762129e69e9f6152a6c4265f0b73a1d2ca7c43740ba458ab5b02628e4c
font_01_sfnt_off0000e16e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16E 10088 bytes
SHA-256: ecd4613a67974c50e596424d710fa04b967b7571dc1e7faa64b104387a333592
font_02_sfnt_off00010405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10405 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378