Malicious PDF — malware analysis report

Static analysis result for SHA-256 73fcc9249c3b52ea…

MALICIOUS

PDF

102.1 KB Created: 2021-01-17 13:52:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 268ff55a60c52c7a6b6149652e92555e SHA-1: dba6b34ae0eef67da49f5a661cbda409657a2437 SHA-256: 73fcc9249c3b52ea763690e55f27f593a457d0af5b89bb6105d0879a6364f5ba
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to S3 buckets, which is characteristic of a link farm or SEO manipulation. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic suggest the primary goal is to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9878

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://trafffe.ru/aws?utm_term=aerosolized+form+meaning
    • https://site-1178280.mozfiles.com/files/1178280/vamudod.pdf
    • https://site-1244479.mozfiles.com/files/1244479/friendship_day_photos_hd.pdf
    • https://widuboxizivibib.weebly.com/uploads/1/3/4/3/134315701/burotudavo.pdf
    • https://site-1173368.mozfiles.com/files/1173368/zejuwufeburi.pdf
    • https://site-1167931.mozfiles.com/files/1167931/94810398765.pdf
    • https://site-1174368.mozfiles.com/files/1174368/8404110954.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • http://www.opentle.org
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/vavale/furupitovezos.pdf
    • https://s3.amazonaws.com/tumasun/gitlab_command_cheat_sheet.pdf
    • https://s3.amazonaws.com/memul/43310139451.pdf
    • https://s3.amazonaws.com/wopari/king_edward_vi_school_southampton_ofsted_report.pdf
    • https://s3.amazonaws.com/jeponowon/alakazam_pokemon_go_raid_guide.pdf
    • https://s3.amazonaws.com/neviwove/69427147329.pdf
    • https://s3.amazonaws.com/jepavilutabilel/zimbabwe_affidavit_form_example.pdf
    • https://s3.amazonaws.com/tuzamada/miwixila.pdf
    • https://s3.amazonaws.com/nefunupu/6587417527.pdf
    • https://s3.amazonaws.com/taguxif/bhavesh_mishra_ias_marksheet.pdf
    • https://s3.amazonaws.com/gitipelut/barsaat_movie_songs.pdf
    • https://s3.amazonaws.com/zerejibixupav/bangladesh_embassy_qatar_passport_renewal_form.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 10

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_009_off000152a3.bin
ba0e70cf8017bcc3fc2ddcb77e9360caf2e6b39e44d3a4c30a9ed18797a1908c		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x152A3 18268 bytes
font_00_sfnt_off0000d918.bin
612cb28e98d372f8e22ef1cd298de17a26975d61c11dff5034cfd601208dae9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD918 3440 bytes
font_01_sfnt_off0000e557.bin
98a698d9596f2a85f2efd509ca1e9548f686012a41a4e283a889601a1e7f6ca9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE557 4976 bytes
font_02_sfnt_off0000f61d.bin
c206ac4eca120f096112d408dff6b33a2f721090936d80486df636e1cd240fde		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF61D 2656 bytes
font_03_sfnt_off00010123.bin
3702365b3034b9d7945da23b991b5e2ac3f8bb06d1ba3be7e5ba1b5d8dd48c9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10123 2328 bytes
font_04_sfnt_off00010bda.bin
e66bd646ff29f48b94a898642357a1d5295b77faffa0bd70eb77acb4aebc9a97		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDA 2108 bytes
font_05_sfnt_off000115a6.bin
e3b4dfa022b1997d8f7fde3cdbf73c456f572deb688c0b77633f9b333ae4ea73		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115A6 5768 bytes
font_06_sfnt_off00012423.bin
bd2e36ca7fd51ebe138d8be4beaf555926b46069938bacaf72f8a5c391786f20		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12423 15612 bytes
font_08_sfnt_off00016f4d.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16F4D 4324 bytes
font_09_sfnt_off00017d4d.bin
3294ae4e72832d4672e68b804b1489921f69fbc885b0f93fb3beac3ea9f25642		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17D4D 2644 bytes

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