Malicious PDF — malware analysis report

Static analysis result for SHA-256 088fb0d81a5632b8…

MALICIOUS

PDF

109.2 KB Created: 2021-04-11 18:42:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 577144c7e2ed76e018bf8b966bdc1b86 SHA-1: 2ec9addb880040d564f6f0a14db0b78f2fa8696d SHA-256: 088fb0d81a5632b8dbd974e03ecdc5ef42348e7be391eaaf009ef22f23234600
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of embedded external links, as indicated by the PDF_SEO_LINK_FARM heuristic. Several of these links point to suspicious domains such as 'botokaw.ru' and 'rerubin.space', suggesting a phishing or malicious redirection attempt. The ClamAV detection and ML classifier further support the malicious nature of the file, likely serving as a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://botokaw.ru/strik?utm_term=how+to+ask+questions+tarot+cards
    • http://rerubin.space/tokyo_guidelines_for_cholangitisgj3gk.pdf
    • http://therarbooks.com/fall_leaves_report_michigangjmk4.pdf
    • http://axecheat9.xyz/26017628388vh1g.pdf
    • http://anarchymedya.com/65010462742gj4ea.pdf
    • https://cdn-cms.f-static.net/uploads/4450724/normal_60307126be825.pdf
    • https://static.s123-cdn-static.com/uploads/4493602/normal_60016de951550.pdf
    • http://milanomoda-italy.site/tokyo_ghoul_dark_war_apk_mod_offlinehx9ol.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://dbba0f06-1911-40f0-8c80-a2638c7f81cc.filesusr.com/ugd/b13fd1_f19d159cdc5c44eaaf9b2fccd8003e5c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8c871c1c-094b-4bfa-abc8-6613b2602c14/how_to_reset_kidde_smoke_alarm_after_changing_battery.pdf
    • https://uploads.strikinglycdn.com/files/4e256d5a-7a70-45f7-87ce-b42bc583240d/95660602783.pdf
    • https://uploads.strikinglycdn.com/files/bd20a067-1b9b-4931-8c90-c7e370f23b0c/reading_line_graphs_worksheets.pdf
    • https://814cba0f-f649-4223-bfe6-7884e6e02b9d.filesusr.com/ugd/c1108c_7f1fa9a2018f42bcb960f1bc675f065f.pdf?index=true
    • https://0c2a99dd-71fd-4a0d-b96f-672cfa785c21.filesusr.com/ugd/515c54_9adff8ae2a284bb6973b6873318507d6.pdf?index=true
    • https://d9c73feb-c945-4d97-9d44-ff62a4b57c47.filesusr.com/ugd/12056e_0d5dc5821bcc4f8fb3eb76094c8ec80b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/30a44f61-aa4d-4334-a686-535f00b767df/fomefesiropifagiserixe.pdf
    • https://uploads.strikinglycdn.com/files/0c2a7f1f-5080-4f21-b1aa-83dbd2c35b60/graco_duet_swing_replacement_cover.pdf
    • https://uploads.strikinglycdn.com/files/ea27a9b7-7653-465f-a463-e131765050cb/when_did_school_finish_2018.pdf
    • https://uploads.strikinglycdn.com/files/2c52e08c-3abd-4fd6-b243-233b714a95a8/weluradotediwu.pdf
    • https://uploads.strikinglycdn.com/files/47e7d703-e6b8-4785-b64e-f12d17f8c3cf/london_value_investing_club.pdf
    • https://uploads.strikinglycdn.com/files/7226acb1-29ba-407d-a206-6036ffc4fbb2/tiwetogatekuxib.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 8

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_009_off0001944f.bin
f8ebae8ea2381a5f5a5db4f03c6c737f92a142e66c67ccbdc2f7fea2b5259cac
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1944F 6504 bytes
font_00_sfnt_off0000f9d0.bin
76f34301b0f0f3260df63e8e06ee417912ceebc1ec9b161224d906abd4afa021
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D0 7516 bytes
font_01_sfnt_off00010d54.bin
3d18dca7e3151ab78b523ac4104e86b88c6789bd7feb2b9d7711bf9cdfa03466
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D54 3148 bytes
font_02_sfnt_off00011894.bin
d74fd82f40d1b181c77827a5268bff08868f6d0c899b0b627ba87fef983c151c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11894 5024 bytes
font_03_sfnt_off00012980.bin
a3b179770175167fc105d601e782d97fe9fd5fdbff0be5084ea02020e73dba2c
pdf-font-stream PDF embedded font (sfnt) at offset 0x12980 6280 bytes
font_04_sfnt_off000138e8.bin
36539f6d1ec510897bfbe252ff62363040aa090ee9456364b11a9baa8713665a
pdf-font-stream PDF embedded font (sfnt) at offset 0x138E8 19028 bytes
font_05_sfnt_off00016feb.bin
f3bf7d65e83e0dc75c5df7c05093edf1192c13d377daee4cf108b80aa32c4637
pdf-font-stream PDF embedded font (sfnt) at offset 0x16FEB 16516 bytes
font_06_sfnt_off0001868c.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x1868C 4324 bytes