Malicious PDF — malware analysis report

Static analysis result for SHA-256 86d4818e0e47b575…

MALICIOUS

PDF

78.0 KB Created: 2021-09-21 09:38:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9ddf96b46e996c5f13c1e628dee122d9 SHA-1: 5cadd30439fbcc2e58da08b94ddb0f406bbb00bf SHA-256: 86d4818e0e47b5759bd8937d9032ae1d04b5d304e488f93c86a0ddf36b80a3f6
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, exhibiting characteristics of a phishing or tech-support scam. The heuristic 'SE_CALLBACK_LURE' indicates the document prompts the user to call a phone number, a common tactic for these scams. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure suggest an attempt to redirect users to malicious content or initiate a fraudulent interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://inwebjor.ru/uplcv?utm_term=how+to+share+iphone+contacts+to+android PDF link annotation
    • http://twtime.com/uploads/files/202109181523484702.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/161433e1fdf61d---3058799887.pdfIn PDF document text
    • https://eletmodguru.hu/files/files/guzuzozovi.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/gosogofoku.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/mejixedisa.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/940a7e4b88c7592c305acad65fb9d9ed/22606701731.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/jukatorinixilesitope.pdfIn PDF document text
    • https://sadex.pl/fck/file/57023504859.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///52514202244.pdfIn PDF document text
    • http://pphu-joanna.pl/fckpliki/file/gotefopemofaroxepukobapad.pdfIn PDF document text
    • http://szjglaw.com/uploadfile/file/2021091517560973499.pdfIn PDF document text
    • http://incomingmakedonia.com/files/files/96746490836.pdfIn PDF document text
    • https://tp-pos.com/uploads/image/files/93477523714.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/78837046654.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/49121665552.pdfIn PDF document text
    • http://domosplast.hu/files/file/monofikatulasubavusowo.pdfIn PDF document text
    • https://cobaltinc.org/userfiles/file/33517078080.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/vakagotimelenulixagupuw.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/muzabo.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/55375437993.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/60501820537.pdfIn PDF document text
    • http://cuacuontoanthang.com/media/file/fumal.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/masaninefefeditenape.pdfIn PDF document text
    • http://wamaeassociates.com/images/uploads/originals/file/39843767172.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e35a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE35A 10644 bytes
SHA-256: a329bf87b7358d4c81270cb190950216dbcb692a541c859e072ee7f5e98603cb
font_02_sfnt_off0000fbb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB6 18120 bytes
SHA-256: 3ff91a7cb4ed53266c4205dc51b1b5a22392c7c4e41aae0696d47a09351b9df9