PDF malware analysis — malicious · 4320b2c4e9400c9d

MALICIOUS

PDF

99.9 KB Created: 2021-03-17 16:59:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: bd777eded240779ab8c069ce7d874dc8 SHA-1: dcb6620ab5378889155aedc64ef648d26f271413 SHA-256: 4320b2c4e9400c9d7e863bd0b4079ff9030774627daa9d08ade4ff0664fa7685

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF documents. One of these links, https://jacksth.ru/wix?keyword=what+rhymes+with+guidance, is directly embedded in the document body. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware through the link farm.

Machine Learning

Nyx PDF Classifier malicious score 0.9955

Heuristics 5

Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM

Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
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://jacksth.ru/wix?keyword=what+rhymes+with+guidance
- https://cdn-cms.f-static.net/uploads/4365589/normal_601a9ba28edc0.pdf
- https://static.s123-cdn-static.com/uploads/4469135/normal_600581a757725.pdf
- https://cdn.sqhk.co/jirudumom/9icpibd/traffic_road_signs_and_meanings_in_uganda.pdf
- https://cdn.sqhk.co/soxosovave/idmCggW/runescape_old_school_wiki.pdf
- https://cdn.sqhk.co/guzufaseba/gf80jf7/5918727108.pdf
- https://namulore.weebly.com/uploads/1/3/4/0/134017746/bemezunop-boxevesul-bujasaw-namol.pdf
- https://cdn-cms.f-static.net/uploads/4384045/normal_604f8885cad20.pdf
- https://cdn.sqhk.co/xupodafib/4ib1dCm/93263469715.pdf
- https://cdn.sqhk.co/zezinojox/d6cii8W/one_gotta_go_game_food.pdf
- https://cdn.sqhk.co/sigagegijej/Qjbhi7X/perfect_closing_gift_cutting_boards.pdf
- https://bemofoserobonuw.weebly.com/uploads/1/3/0/7/130739893/9254605.pdf
- https://merejeweja.weebly.com/uploads/1/3/1/3/131381112/latexerepugoworit.pdf
- https://cdn.sqhk.co/ridasozewe/sJjdmgh/nba_2k20_myteam_draft.pdf
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- http://fedorahosted.org/lohit
- http://www.opentle.org
- https://s3.amazonaws.com/galinikagopit/paul_ekman_emotions_revealed_francais.pdf
- https://s3.amazonaws.com/vixuwogetiv/wedding_invite_template_wording.pdf
- https://uploads.strikinglycdn.com/files/21816992-b4c6-41f3-a7d3-61ec207fb948/gewewulurafekato.pdf
- https://s3.amazonaws.com/tarizirefevifab/catia_v5_license.pdf
- https://uploads.strikinglycdn.com/files/0e578189-5337-4815-a55d-ee32290c83e0/short_story_length_for_publication.pdf
- https://uploads.strikinglycdn.com/files/41f6ff3b-e5b0-449a-8101-3bc9f280482e/fire_and_ice_perfume_by_revlon.pdf
- https://uploads.strikinglycdn.com/files/f80d889f-81ef-4b94-a467-dacc49e9d7d0/30123161786.pdf
- http://www.w3.org/1999/02/22-rdf-syntax-ns#
- http://purl.org/dc/elements/1.1/
- http://ns.adobe.com/pdf/1.3/
- http://ns.adobe.com/xap/1.0/
- http://ns.adobe.com/xap/1.0/mm/
- http://ns.adobe.com/xap/1.0/rights/
- http://dejavu.sourceforge.net
- http://dejavu.sourceforge.net/wiki/index.php/License
- http://scripts.sil.org/OFL
- http://www.gnu.org/licenses/gpl.html

Extracted artifacts 9

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_009_off00015605.bin` `36bf4bca2dbe62ed7eea770f09dcbd942e9f30cdfd175f8627c1a83adfc01dda`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x15605	18176 bytes
`font_00_sfnt_off0000d2cb.bin` `e0f0922da2f1b5a441c0ab47f148b203928c2bc4519f23812ab58bc0699b7f5d`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD2CB	5684 bytes
`font_01_sfnt_off0000e6a7.bin` `95eb097fd2ba2029cb97fdb19699b061573cbfedc41287f141c7796daa94a342`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE6A7	5528 bytes
`font_02_sfnt_off0000f961.bin` `dbaab8dcf32bfe64cb008f34eb54f5316f62236e8dffe3de49b44225404383a5`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF961	2656 bytes
`font_03_sfnt_off00010465.bin` `c42118b51b061dffbc196cd4866a2cf76d9f31ae9d0a8f6c06e6ad224a677b24`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10465	2328 bytes
`font_04_sfnt_off00010f1a.bin` `806d12f4c18e044784d20764d58024893796e88f204c306662924b3e907cbcac`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10F1A	2108 bytes
`font_05_sfnt_off000118e5.bin` `2da83060ad210a9a1743b04a22b2cc5ebb14ba7af64fbaa5f25da2d26a1b3d84`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x118E5	6640 bytes
`font_06_sfnt_off00012a83.bin` `5246067f7ff5a16e05ea4eee7417c6ef111d11e93d1b94dfc7330676a2ea41c2`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12A83	14376 bytes
`font_08_sfnt_off000172d1.bin` `c6f56f051084033b0538cdf61e3e457d22b7f2c2ea46d10ec59ebb2b81e63971`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x172D1	3276 bytes

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