Malicious PDF — malware analysis report

Static analysis result for SHA-256 047b310db631efea…

MALICIOUS

PDF

75.4 KB Created: 2021-09-08 19:54:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: bd0a06cf3ffb795570e9a455ad23de6f SHA-1: 1e7530fa50d6b6b9a5012f237d863ef96175ca0f SHA-256: 047b310db631efea7644ceba40335b452a878f70a40c41d8bae1aad661fec9b6
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains a large number of embedded URLs, many pointing to unknown domains, suggesting it functions as a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, indicating a potential phishing or malware distribution scheme. No scripts were extracted, but the structure and URL distribution are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • 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.
  • 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://ciiinnovationsummit.com/ci/userfiles/files/56012823039.pdf In PDF document text
    • https://harkakotony.hu/UserFiles/file/doxalizezajowizibule.pdfIn PDF document text
    • http://foxhill101.com/userimages/13541495954.pdfIn PDF document text
    • https://agatanorek.com/files/file/7848137927.pdfIn PDF document text
    • http://motovelo-nmsk.ru/userfiles/file/koraxodego.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/pesamunejidifa.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/86510461811.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/lelixixode.pdfIn PDF document text
    • http://balade-pierry.fr/userfiles/file/wirokalej.pdfIn PDF document text
    • http://levakov132.ru/userfiles/file/dosepebifipa.pdfIn PDF document text
    • http://www.fuchingrading.com/upload/file/4664323853.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/3vbrnfn6slmda4j4670akl1o2u/xotitajirutele.pdfIn PDF document text
    • https://seedcambodia.org/htdocs/cljr/data/files/5934837205.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138357635578---19500912377.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/84578983052.pdfIn PDF document text
    • http://newtrichur.com/userfiles/file/jekonitugu.pdfIn PDF document text
    • https://derya.afmiletisimajansi.info/resimler/files/3666118430.pdfIn PDF document text
    • https://ketex.com/trcgp/ckfinder/userfiles/files/lalum.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/37713611233.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/nixoviguladobimixisimare.pdfIn PDF document text
    • https://rotterdampools.com/contents/files/vofojomefete.pdfIn PDF document text
    • https://rippa.pt/files/file/kitazinutu.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/81193091384.pdfIn PDF document text
    • http://imcborivali.org/userfiles/file/funoboxoxagodemiluvo.pdfIn PDF document text
    • https://ubranni.com/uploader/files/23744534367.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=gearbox+components+pdfPDF 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_off0000c452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC452 16736 bytes
SHA-256: e63ca69ae296ff60ce2ee195f209aef92350e00eef51592761fab5ce28a51fdf
font_01_sfnt_off0000ef0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0E 10924 bytes
SHA-256: e0ef02ae3b8d0087e0aa74796907793dc9204cf377d10ecf25ca189aba22d5de
font_02_sfnt_off0001082d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1