Malicious PDF — malware analysis report

Static analysis result for SHA-256 901285260bc86d01…

MALICIOUS

PDF

81.9 KB Created: 2021-09-10 17:28:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 35f953953af1f8cbc84fc1ad177e8b04 SHA-1: 402a54ec104d7504174744a3178c49c6cd14206a SHA-256: 901285260bc86d0136b8c67ab07cdaab525f62f6868c0f4c003f8ad0f0bea78f
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm and contains a callback lure, prompting users to call a phone number for fraudulent purposes. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it is designed to lead users to malicious content or initiate fraudulent phone interactions.

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 http://dieutrimun.myphamkangnam.vn/webroot/img/files/61354546846.pdf In PDF document text
    • http://stphilomenaonline.org/userfiles/file/rovetufepoferugor.pdfIn PDF document text
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/51245554411.pdfIn PDF document text
    • http://sissonne.hu/editor_up/80938636457.pdfIn PDF document text
    • http://bjqyms.com/filespath/files/20210909201002.pdfIn PDF document text
    • http://skupka23.ru/upload/m/33220521682.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/62078315508.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/11339110402.pdfIn PDF document text
    • https://ceylanotel.com/firma/files/vexivaxiv.pdfIn PDF document text
    • http://dlzhrjd.com/images/uploadfile/files/gidosejonuvupiwo.pdfIn PDF document text
    • http://ginzaoakland.com/uploads/files/31648375508.pdfIn PDF document text
    • https://podgoricki-klub.me/userfiles/file/ligimopatini.pdfIn PDF document text
    • http://senseoftourism.dk/userfiles/file/minovidoxe.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396b2a765b1---feseninivimixiz.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/nufugofubelerufodugog.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/mefejixikojebomomezovod.pdfIn PDF document text
    • https://hinodecoder.com/userfiles/file/40445292556.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///36889893217.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/27452396699.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///nawavafapuniwefa.pdfIn PDF document text
    • http://zagazzo.com/userfiles/file/pusoge.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/46425906764.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1631190231.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16139b3ab821c2---9063742483.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/jetubuxakapu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+turn+dark+mode+on+instagram+androidPDF 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_off0000db13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB13 17608 bytes
SHA-256: 598f0ff7e71d1d73ae2bea918ee62fb2acaaecc3de93560c1eaae96e33537de1
font_01_sfnt_off000108c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C5 10812 bytes
SHA-256: e320cc7f8eb5c361c65a668c7720607269ba3948b13f1998c179eeee04f91af8
font_02_sfnt_off00012189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12189 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1