Malicious PDF — malware analysis report

Static analysis result for SHA-256 f40d1e09344165bf…

MALICIOUS

PDF

86.4 KB Created: 2021-09-18 18:51:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 71a4a1e090da381aef9902743bbaa01c SHA-1: 2db0c609c0c9031331754fe4697a5781dc0fb82c SHA-256: f40d1e09344165bf46f8aa17ddcd493920b1ca75c778648ad1f40c79a35f2b5e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by multiple heuristics, including a critical ClamAV detection and a high ML score. It contains numerous embedded URLs pointing to external PDF files, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates these links are likely part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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.
  • 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://yuanhebiotech.com/upload/files/lijifawimedaw.pdf In PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/bibododok.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/95230283564.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/73918517894.pdfIn PDF document text
    • http://boki.hu/editor_up/jokosi.pdfIn PDF document text
    • https://ritascreation.com/userfiles/file/98405164510.pdfIn PDF document text
    • http://erfaspot.com/resimler/files/5778258619.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/xivubur.pdfIn PDF document text
    • http://gyarmatilovastorna.hu/userfiles/file/93682069211.pdfIn PDF document text
    • https://kolegium.inaheart.org/upload/files/mepuruxoxemikipusu.pdfIn PDF document text
    • http://pantipplaza.com/userfiles/file/15698902799.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/manupo.pdfIn PDF document text
    • https://online-wums.com/files/files/49891785558.pdfIn PDF document text
    • https://luckysurface.itweald.com/uploads/files/613a722546b17.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142a7ff6ac46---nanapiz.pdfIn PDF document text
    • http://world-spa-resorts.com/dok/43256536456.pdfIn PDF document text
    • https://zzwgjx.com/d/files/17992632710.pdfIn PDF document text
    • http://aqcorth.specialty-match.com/upload/files/14695956849.pdfIn PDF document text
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/33667747319.pdfIn PDF document text
    • http://baoveantam.info/upload/files/bonabavejak.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136383131ff1---katawaparadiparu.pdfIn PDF document text
    • http://xinghui.co/upload/ckimg/files/202109140501424992.pdfIn PDF document text
    • https://alariel.be/userfiles/file/buzuwojitotidan.pdfIn PDF document text
    • https://austarpharma.com/upload/files/78042841018.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=limbo+apk+2021PDF 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_off0000e85b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10072 10248 bytes
SHA-256: 3234c21d68fa16b029b43e8b4c074902f67fa223d7fb3cca8dab3ea95edbad68
font_02_sfnt_off0001173e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1173E 19844 bytes
SHA-256: 88d580141674e8255eaf4b0632b52fd7e487008923263f082c9d0b8064b2a48c

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