Malicious PDF — malware analysis report

Static analysis result for SHA-256 1350ab5334fd3a9d…

MALICIOUS

PDF

79.2 KB Created: 2021-09-11 10:53:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6f6aefb32d18f59f4a149382d05f01e2 SHA-1: b2b0f97c8b36f7d0403b2b7dc0da5a8f17df84dd SHA-256: 1350ab5334fd3a9de89342bc441fea71a76123f96ad236f7a776e4ded2d2364a
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external URLs, including one pointing to 'allytemp.ru', suggests a phishing or malware distribution campaign. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document may be part of a multi-stage attack, potentially requiring a password to decrypt a payload.

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://allytemp.ru/uplcv?utm_term=how+to+unlock+a+locked+phone+android PDF link annotation
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/70294232323.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/sd4g82o02k72ftoponr713mfvc/lorolodiv.pdfIn PDF document text
    • http://www.tractortools.cz/ckfinder/userfiles/files/zaforifixut.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/42900798461.pdfIn PDF document text
    • http://www.satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/34446321381.pdfIn PDF document text
    • http://car-zone.sk/data/data/file/24860311321.pdfIn PDF document text
    • http://swatimishra.in/uploaded_files/userfiles/files/zevimazevaxaxoxodonil.pdfIn PDF document text
    • https://cottingham-group.com/cufiles/files/gosiriwatejeresuki.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210911_004255.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/nodara.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/rorozin.pdfIn PDF document text
    • https://cedria.es/DOCUMENTS/FotosFCKEditor/file/38306016906.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/wifurojuwupiwowu.pdfIn PDF document text
    • https://serviceelectric.ca/userfiles/file/95324528679.pdfIn PDF document text
    • https://berbagiangka.com/contents/files/69019762834.pdfIn PDF document text
    • http://ukrfirework.com/images/file/gatukafitu.pdfIn PDF document text
    • https://olboihorgaszto.hu/editor_up2/zewekelutero.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-8/20210908124501921286.pdfIn PDF document text
    • https://fultoys.com/userfiles/tatetoratigefoga.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/97533447408.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021090621340570554.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_off0000d401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD401 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC13 16604 bytes
SHA-256: 2bcf0d1bc3efd54934efa3dc856390f4229539896654dbcd13ede6c64b217381
font_02_sfnt_off00011733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11733 10712 bytes
SHA-256: c194fd71f49a4446012b60fb94161d07f37b3baddda5c9524105469ef7f0c5cb