Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9e2b11e9f99f39f…

MALICIOUS

PDF

87.4 KB Created: 2021-09-14 00:07:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c89b0da9dddc6c4e7f6c60a10bd3ed76 SHA-1: 447aeaebdb690c87f2794ad4d07c75999db945d5 SHA-256: e9e2b11e9f99f39f22770a2ae67d9e28d1614691183f199e56fac545d7ca205c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, with a critical heuristic firing for PDF_SEO_DISPOSABLE_LINK_FARM indicating a link farm on disposable hosting. An embedded JavaScript stream was detected, which is commonly used to redirect users to malicious sites. The numerous external URIs, many of which are unknown, further support the phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • 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.
  • 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 http://frangarcia.eu/upload/file/25660089220.pdf In PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/ac67710f6eda5d2f1b1a84f7f4b8e8c8/wozoluwibuxujarugalami.pdfIn PDF document text
    • http://dom-2000.ru/ckfinder/userfiles/files/mudovoramazejejileloban.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/33336361443.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/69894946703.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/wizexutalijegotukeboteko.pdfIn PDF document text
    • http://highdeal.linkeo.net/ckfinder/userfiles/files/84913720773.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/jaxinuwojegema.pdfIn PDF document text
    • http://directartdeal.com/uploaded_files/userfiles/files/rogobajawudexetinofifijop.pdfIn PDF document text
    • https://expobar.vn/app/webroot/files/images/pages/files/97716284458.pdfIn PDF document text
    • http://novehorizonty.sk/userfiles/file/senedinixij.pdfIn PDF document text
    • http://materialdeestudo.top/userfiles/files/35969631791.pdfIn PDF document text
    • http://www.77ice.com/upload/files/70971384933.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/muzitit.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/miwomavit.pdfIn PDF document text
    • https://j26clean.com/upload/files/96814836969.pdfIn PDF document text
    • http://thesciencenetwork.org/uploads/files/92834126803.pdfIn PDF document text
    • http://medicom.pl/userfiles/file/97083556847.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/zovevojadewoxezijoxikazif.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/89418366540.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=best+note+taking+app+samsung+tab+s7PDF 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_off0000efa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA7 10884 bytes
SHA-256: 7316b56dc5952f7ebd7c366ae355bac81b27af31b7f4d29b280c70ed2a8d0650
font_01_sfnt_off000108b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B9 18188 bytes
SHA-256: dc57fde4e3b1aa78e0662934ed3fe82d5e38ddd86dcfaf83beb039c1e346e310
font_02_sfnt_off000137b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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