Malicious PDF — malware analysis report

Static analysis result for SHA-256 f100b8017694f30b…

MALICIOUS

PDF

85.8 KB Created: 2021-09-21 21:14:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 38ce70599d3fc2bb713ae65beab10667 SHA-1: c6df4ab9d2cca954a052f0a3f9e02e6c66b96d14 SHA-256: f100b8017694f30b28dbe46e305dbb9aff2958e0650758f2de9dbe0dc52faaf6
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics and a machine learning model as malicious, with ClamAV identifying it as a phishing trojan. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to trick users into calling a phone number, a common tactic in callback phishing and tech-support scams. While no scripts were explicitly extracted, the presence of numerous embedded URLs, many pointing to potentially disposable hosting, suggests an attempt to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://caminodesantiagoenmoto.com/assets/ckfinder/core/connector/php/uploads/files/42729279764.pdf In PDF document text
    • http://huichem.com/ckfinder/userfiles/files/34071170044.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16145b9562ec69---zebutagarebalewidija.pdfIn PDF document text
    • http://wonderpanel.com/app/webroot/img/file/kozefowikiradixewafuze.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/49625966162.pdfIn PDF document text
    • http://www.abcklima.hu/data/editorfile/vutamimapipilo.pdfIn PDF document text
    • http://arcadia-fitness.es/userfiles/file/xefosevegoseput.pdfIn PDF document text
    • https://denimder.org/resimler/files/18760082802.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/42992009624.pdfIn PDF document text
    • https://zhongzing.com/uploads/files/202109162322221568.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/25164513914.pdfIn PDF document text
    • http://ptaki.info/imgekoprojekty/files/sebamasotox.pdfIn PDF document text
    • http://kartelabasligi.com/images_upload/files/susepuvefedo.pdfIn PDF document text
    • https://maconlux.ovh/userfiles/files/ledomo.pdfIn PDF document text
    • http://fatfailogistics.com/fckeditor/files/file/3144765967.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130eab4d6a97---dabapuzawisaluzisuz.pdfPDF link annotation
    • http://chickendaylacrescenta.com/uploads/files/joxamokuxiligamodololag.pdfIn PDF document text
    • http://hzxgdz.com/images/upload/File/11110143876.pdfIn PDF document text
    • http://adidravidar.com/ckfinder/userfiles/files/wuluvufumefuxok.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/11406087288.pdfIn PDF document text
    • http://kantoromega.pl/userfiles/file/binewusulelusitibuzuma.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/55733610172.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16149afe3b03ab---14069489038.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///kafokasutojejam.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/nipemifolekujudud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+reset+old+android+phonePDF link annotation
    • 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_off0000eafe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFE 10568 bytes
SHA-256: 3c3e1f160dd1c3b527ba44078ccc8ad510802d4cd02a5eb2f15d854e3844324e
font_01_sfnt_off00010302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10302 17620 bytes
SHA-256: 0de471b68943065dfdae2e0db12ecf5f347dc4c3de6bf2310d70d7a53a8bbc07
font_02_sfnt_off00013116.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13116 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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