Malicious PDF — malware analysis report

Static analysis result for SHA-256 3886a215bca476aa…

MALICIOUS

PDF

81.5 KB Created: 2021-09-12 15:58:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: d464888f71b2fcd560cb4b99dd0cfbee SHA-1: 763b846f78d4748b23576d95befe37e29d317bd5 SHA-256: 3886a215bca476aaa03ba00fe28af61a9ab264515b6aa76f7704ea45ec3cae58
146 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of callback phishing. The PDF contains numerous embedded links, many pointing to potentially malicious domains, and the document body suggests a lure for a tech-support scam or billing dispute. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://glassick.com/userfiles/file/pinuzefuzarox.pdf In PDF document text
    • http://pro-group.ru/userfiles/files/zawokitukovatane.pdfIn PDF document text
    • https://juraganmonyet.com/contents/files/44620354075.pdfIn PDF document text
    • https://orderpoet.com/ckfinder/userfiles/files/bogolosimubonufivot.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/7626274867.pdfIn PDF document text
    • https://ms2oke.com/contents/files/63515220071.pdfIn PDF document text
    • https://shibbirs.com/media/files/8741504663.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/lodojatulafadago.pdfIn PDF document text
    • http://ukonlinedirect.com/userfiles/files/satonemim.pdfIn PDF document text
    • http://thebankcardservice.com/uploads/files/12697856290.pdfIn PDF document text
    • https://ferest.ro/imagini_ws/safajekebivuma.pdfIn PDF document text
    • https://heart-calligraphy.com/uploads/files/202109120720342549.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/74294625322.pdfIn PDF document text
    • https://adminico.nl/userfiles/file/dadesavorimevapiriki.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/32953083197.pdfIn PDF document text
    • http://life-homeshop.com/asset/uploads/files/28579651683.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/36800086913.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/82830548825.pdfIn PDF document text
    • http://www.jfac.kr/ckfinder/userfiles/files/rukobuwizap.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/jaxogu.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/28139940672.pdfIn PDF document text
    • http://tvsatkrosno.pl/userfiles/file/40893660335.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=men+hairstyle+oval+face+typePDF 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_off0000deb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB1 15984 bytes
SHA-256: d12f50c1997b024cda5b755e35dbcd719cfe622d551db75ca46b42f846b235ef
font_01_sfnt_off000107ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107EF 10752 bytes
SHA-256: fedad1919f8f219b30287a45a282d50bbe3add7f5a0fae4da6b89dd67953e8e3
font_02_sfnt_off000120af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1