Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1a4e45f4b2626aa…

MALICIOUS

PDF

70.4 KB Created: 2021-09-27 04:21:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 46c5a67808629e819ba88e817860ae1c SHA-1: 7f8a739cc9b443f63715b5287312aa648d127099 SHA-256: c1a4e45f4b2626aa7b1f79c57ab855dd38eb3fabc83f3db35dc90530409ebf88
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to disposable hosting or acting as link farms, indicating a likely attempt to redirect users to malicious content. The presence of a callback lure heuristic further suggests a phishing or scam-related purpose. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://philabc.ru/uplcv?utm_term=is+it+safe+to+use+developer+option+in+android PDF link annotation
    • https://www.fangjin.org/ckfinder/userfiles/files/zorabarij.pdfIn PDF document text
    • https://www.whoamiandwhyamihere.com/ckfinder/userfiles/files/25349589649.pdfIn PDF document text
    • https://eliteprotectiveservices.net/ckfinder/userfiles/files/10038216935.pdfIn PDF document text
    • http://ukrkarta.ua/fckeditor/userfiles/file/gowubojewuzirofujomudaf.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/86648494429.pdfPDF link annotation
    • http://vce34.ru/attachments/file/domikuxuzatobasebulepiwum.pdfIn PDF document text
    • http://phyllisrubensteinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wurosiz.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/72084091168.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/49170047171.pdfIn PDF document text
    • http://mayjack.com/upload/files/97850301518.pdfIn PDF document text
    • http://rapet.hu/files/70459685904.pdfIn PDF document text
    • https://openkomm.yussfone-crm.com/userfiles/file/87215238763.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/25407287266.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/xizosokitimemitunanad.pdfIn PDF document text
    • https://nedimgame.net/calisma2/files/uploads/misasone.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/85954290041.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/161438cda51d46---sebukewamaxukalowetovidon.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/tarifutenadapokekobipiz.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/pasaxegijonebavubuvu.pdfIn PDF document text
    • https://www.solucionaesp.com/ckfinder/userfiles/files/telorobawuduvabigunin.pdfIn PDF document text
    • https://mehreganimaging.ir/images/upload/files/karakuw.pdfIn PDF document text
    • http://fese.in/ienupdimages/images/files/35768742309.pdfIn PDF document text
    • https://redac.ch/upload/zagibelogadanafuwoliz.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/50389960202.pdfIn PDF document text
    • https://mannoorpally.com/uploads/file/34210534455.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_off0000b475.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB475 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC8C 10608 bytes
SHA-256: c8c245dc31ee7c39727c9f58767003aaa0dfea315d63046bda5dd1d5e9853125
font_02_sfnt_off0000e4e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E5 15260 bytes
SHA-256: 455eea6922073a1149dec0fc53ed230f41581a40efc4c5459af2a3ebd3a89f76