Malicious PDF — malware analysis report

Static analysis result for SHA-256 5518655a8475c870…

MALICIOUS

PDF

81.5 KB Created: 2021-09-13 12:21:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 9da320a29c74b5b70b039b76aeaff897 SHA-1: 49f999a5affd0f900f29de9c9c5fb5e14b407e25 SHA-256: 5518655a8475c870ed407cfade5db95ff365ad799ac7fb94d27f7c9b9442757f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs pointing to link farms hosted on disposable domains, strongly indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection further support its malicious nature, flagging it as a phishing trojan. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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://crysiq.ru/uplcv?utm_term=mobdro+tv+app+download+for+ipad PDF link annotation
    • http://avtokapriz42.ru/userfiles/file/giwupakajoteluberofeva.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/zutegejejokuvevev.pdfIn PDF document text
    • https://gosselindesign.com/images/from_fckeditor/fichiers/xivuvimerapasakepiregiw.pdfIn PDF document text
    • https://oasis-travel.ro/files/vurav.pdfIn PDF document text
    • https://intervalhousehamilton.org/ckfinder/userfiles/files/85758606323.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16132443ea7711---pubuwe.pdfIn PDF document text
    • http://tourister.kr/userfiles/file/64250985582.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/33147265528.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/datonosadakewosatumiriro.pdfIn PDF document text
    • https://medbioplast.com/klucharnet/images/file/guteros.pdfIn PDF document text
    • https://harmony.im/userfiles/file/5931201625.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/23350535530.pdfIn PDF document text
    • http://discus-rus.ru/upl/file/visurazemosop.pdfIn PDF document text
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/32611201781.pdfIn PDF document text
    • http://athaj2.specialty-match.com/upload/files/16407954781.pdfIn PDF document text
    • http://jj-metals.com/userfiles/file/2021091109532273499.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161313f8d97019---soxonorefukasowirutoli.pdfIn PDF document text
    • http://shiokuda1.com/contents/files/30579698979.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/1432483108.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/28493671044.pdfIn PDF document text
    • http://gndpta.eu/news_objects/files/bekofakipusafaxivumeju.pdfIn PDF document text
    • http://studioferrato.it/userfiles/files/lutilevemibusifis.pdfIn PDF document text
    • http://sellmysayarah.com/userfiles/files/wigabugenoditepimoza.pdfIn PDF document text
    • http://101eyewear.com/luutru/files/wexelulejeduxegagi.pdfIn PDF document text
    • https://makenie.com/upload/files/vopimomupeto.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_off0000d90f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90F 18300 bytes
SHA-256: 46bfba5b5d8d94b53840230b2681a5d27bc44c9e7c51759943c5f129f82374db
font_01_sfnt_off00010882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10882 10476 bytes
SHA-256: e47793a281a9264ec2d0500b9bf3668f1e4bc8192cdb68036fd8bfaea5f75408
font_02_sfnt_off00012032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12032 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1