Malicious PDF — malware analysis report

Static analysis result for SHA-256 86e0f1b9a07ca1a6…

MALICIOUS

PDF

70.8 KB Created: 2021-09-22 12:20:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5087e2c9ea6a22c3cc09fe1c56b4c498 SHA-1: 4235f26c960104689e3feb273b303c95bea1e265 SHA-256: 86e0f1b9a07ca1a69b5fac55a675cbd79432eb95b90c986c7cc1daf0f75fd162
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URLs, with one heuristic specifically identifying a link to an algorithmically-generated URL on potentially disposable hosting. ClamAV also detected this file as Pdf.Phishing.Trojan. The embedded JavaScript and suspicious URLs suggest an attempt to redirect the user to malicious sites or download further payloads, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://catamma.ru/uplcv?utm_term=mobile+parking+enforcement PDF link annotation
    • https://superiorservicesandsolutionsfl.com/nbloom/fckuploads/file/senadogexigugatefugalir.pdfIn PDF document text
    • https://apapunada.com/contents/files/90921865384.pdfIn PDF document text
    • https://ph789.com/pinhsuan/files/file/lufodetavirevemuradeg.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/44720715828.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/xonutidabuberesuwo.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/77518873580.pdfIn PDF document text
    • http://mgtuae.com/uploads/file/gejasefakujujepopiwazasa.pdfIn PDF document text
    • http://rts-3.ru/upload/files/pejuboderasiwa.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/widixewuxanuzonogusejomu.pdfIn PDF document text
    • https://cinemaparadiso.site/uploads/files/lakamig.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-10/20210910195832144497.pdfIn PDF document text
    • https://studybrilliant.online/app/webroot/img/userfiles/file/91324177715.pdfIn PDF document text
    • https://ratoempat.com/contents/files/73589425387.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/67055741572.pdfIn PDF document text
    • http://skia22.ru/pic/file/35609333380.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d98bec1dd6---ribudodatapizudaxak.pdfIn PDF document text
    • https://www.jdconstinc.com/ckfinder/userfiles/files/23653221389.pdfIn PDF document text
    • http://quimis.net/js/ckfinder/userfiles/files/vikiguvebijibajerapapino.pdfIn PDF document text
    • https://linardi.ru/files/file/jewine.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/42475676865.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/relizexo.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/lojupox.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/xepuvifagan.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_off0000b64d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB64D 15176 bytes
SHA-256: 87387686cad308b3aeccfa82f7197aff4b4dcfc5f45bf6ab697bc9aa4a9903a0
font_01_sfnt_off0000dca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BF 10880 bytes
SHA-256: 69bb42be113952d56c16de06e469fb0a4723ac9523dbf6c143741958392dc737