Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8ab4cc67c54cd98…

MALICIOUS

PDF

81.7 KB Created: 2021-09-22 22:19:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9276bb770941d2ae88d1826c415a2baf SHA-1: 8087eb6afddf56a27f6eb72331541bfaddd2360d SHA-256: e8ab4cc67c54cd98ad00b427cec4041ad518a30b1ab863fd6bb67dd64e030c15
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristic firings indicating malicious intent, including random and SEO-optimized disposable links. The ML classifier and ClamAV detection strongly suggest this is a phishing or trojan PDF. The embedded links, such as http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/89903716109.pdf, likely serve to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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
  • 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 https://oniceh.ru/uplcv?utm_term=install+rom+android PDF link annotation
    • http://disonde.com/filespath/files/20210914083403.pdfIn PDF document text
    • http://kreativitaet-stadlhofer.at/global/images/userfiles/file/wikidibenu.pdfIn PDF document text
    • https://www.geya99.com/ckfinder/userfiles/files/74393246668.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/83052030208.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/kovifisebipulepanavifipa.pdfIn PDF document text
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/89903716109.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138363507eb7---rigovek.pdfIn PDF document text
    • https://suacuachuyennghiep.com/uploads/files/43088390638.pdfIn PDF document text
    • http://veszpremlizards.hu/_user/file/nasabelof.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/xugijamasisiv.pdfIn PDF document text
    • https://jagamimpi.org/contents/files/gawiwuxiwekajej.pdfIn PDF document text
    • https://proxkimya.com/resimler/files/75793671290.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/52477325706.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/lovuxelura.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/7976125509.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/57009089019.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/xudekisuretinoruwod.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/mepejefusavidirug.pdfIn PDF document text
    • https://rajatotogroup1.com/contents/files/pufedakerawesokuvowifezu.pdfIn PDF document text
    • http://morpheus-architects.com/file_media/file_image/file/jugofokusutogoxatoragibi.pdfIn PDF document text
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/20129973969.pdfIn PDF document text
    • http://sun-apartments.pl/data/pages/31094010363.pdfIn PDF document text
    • https://kingyao.com/uploadfiles/files/20210906_000330_6204.pdfIn PDF document text
    • http://svadbavmoskve.com/content/xuploadimages/file/waxixofejezide.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/kabuberikowajafedap.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/momizur.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_off0000dd73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF585 17336 bytes
SHA-256: d64f7b2d21a0a60d0454aaca147e4564ce8d15dd653c3e30aadc5238d2b3aaa1
font_02_sfnt_off000122b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B4 10228 bytes
SHA-256: 6953096b6b3329f12f8cd360fe26ffff45c19b72f1be3cf0839501c2452e7fd2