Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2b02a6c1594d6e6…

MALICIOUS

PDF

76.2 KB Created: 2021-09-19 05:24:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 167fa7c0ce00d4893a08f18f3dc3a81b SHA-1: da6ee0beee81dcae7367c73b1e584645fd3a2f56 SHA-256: a2b02a6c1594d6e60c6c49b56932881ca271b515a91530b6f0908c76602a1b97
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with a high-confidence heuristic flagging a link to an algorithmically-generated URL. ClamAV also detected this file as Pdf.Phishing.Trojan. The presence of multiple distinct hosts and links suggests an attempt to distribute malicious content or phish for credentials. No scripts were extracted, but the overall structure points to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • 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.
  • 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://xinxinhouseware.com/uploadfile/files/8609588829.pdf In PDF document text
    • http://www.gabrielamaciel.net/images/content/file/58137863138.pdfIn PDF document text
    • https://unitedpetexpress.unitedreloth.com/ckfinder/userfiles/files/bewafovagule.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/59437691351.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/bagezisevutebaxapolax.pdfIn PDF document text
    • http://ateliergermain.club/sites/default/files/file/32253215851.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/46296226207.pdfIn PDF document text
    • https://rewaqousha.net/userfiles/files/86481637710.pdfIn PDF document text
    • http://vhshf.de/File/95400937988.pdfIn PDF document text
    • http://tataservice.it/userfiles/file/44495182666.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/munajukapevagozananubil.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/4338085427.pdfIn PDF document text
    • https://perfectprojects.ro/userfiles/file/95814883127.pdfIn PDF document text
    • http://xn--c1aejbdnke.xn--p1ai/admin/ckfinder/userfiles/files/totefunufumobuda.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/fitupetezeripawavif.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/7jftjdic738r36beuen0d74jg5/vekelejijikariw.pdfIn PDF document text
    • https://andana.us/files/files/vumuxugemupekeju.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/pegukezago.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/rerarola.pdfIn PDF document text
    • http://abwjefferson.com/uploads/files/bexiz.pdfIn PDF document text
    • http://0225674989.kad.tw/kads/ckfinder/userfiles/files/gidarizopesukubom.pdfIn PDF document text
    • http://zespolbahamas.pl/zdjecia/file/lavuledire.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/jezelaxaxukurudagi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=how+do+i+create+a+live+wallpaperPDF 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_off0000c7da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7DA 16956 bytes
SHA-256: 084f1227f9cf414845fd25c53b4699359469f33e5dfc29e1f9996bd0daf46a48
font_01_sfnt_off0000f39f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB6 10376 bytes
SHA-256: 72021f8bac6fff93b8f0e87e63cd721bd9fe8454a66afb637c39bf4fde3d2381