Malicious PDF — malware analysis report

Static analysis result for SHA-256 1df4680b08695f4d…

MALICIOUS

PDF

99.5 KB Created: 2021-03-09 09:06:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a91ab1cfed5dee703408e15ee404d331 SHA-1: 9a8b009c4c254b07a353041c47dd67e549fce94e SHA-256: 1df4680b08695f4d2a5056b2515ed9dee991a10e568b69b7550e7fe79a713bd1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, identified as a link farm, suggesting a deceptive SEO or phishing scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a date, but no clear instructions or lures beyond the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://fokemale.ru/award?keyword=aquiles+nazoa+poemas+pdf PDF link annotation
    • https://sunutefe.weebly.com/uploads/1/3/5/3/135350425/giwatotika-vifetefewiko-ziduka-fogenefev.pdfIn PDF document text
    • https://samivixawudajan.weebly.com/uploads/1/3/4/6/134634686/noxefuwu.pdfIn PDF document text
    • https://bemetezebore.weebly.com/uploads/1/3/4/8/134882820/1434614.pdfIn PDF document text
    • https://vulopinuvi.weebly.com/uploads/1/3/1/1/131164419/bedomoxifosu-rovunok.pdfIn PDF document text
    • http://warowusavi.mywebcommunity.org/ariens_snowblower_manual_824.pdfIn PDF document text
    • http://rezolurumo.iblogger.org/gaming_buddy_pubg.pdfIn PDF document text
    • https://katabeguravaka.weebly.com/uploads/1/3/1/4/131407194/a698dcfdd222f21.pdfIn PDF document text
    • http://gojavodevagajuw.mygamesonline.org/fraction_decimal_percent_table_worksheet.pdfIn PDF document text
    • http://wisemad.22web.org/la_fuerza_de_sheccid_personajes_principales_y_secundarios.pdfIn PDF document text
    • http://lanejaselisipu.22web.org/92598516344.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jifedefujodu/bilijidapajupaj.pdfIn PDF document text
    • https://s3.amazonaws.com/vavebufevodutob/sokufosejin.pdfIn PDF document text
    • https://ebba3e40-d49f-4cc8-b137-373bb1124918.filesusr.com/ugd/384ea4_63791104f2c3494bb1b301f7b424e4af.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/feborobegibew/43470844191.pdfIn PDF document text
    • https://de99c131-68bf-4271-bcef-cda292486844.filesusr.com/ugd/f5892c_45672f95433e44f0804e8f0a9df83dd5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xojafemori/le_journal_el_watan_algerie.pdfIn PDF document text
    • http://kozogasivufi.myartsonline.com/how_much_does_a_cfa_earn_in_south_africa.pdfIn PDF document text
    • https://s3.amazonaws.com/zevutebulaworel/33792482011.pdfIn PDF document text
    • https://s3.amazonaws.com/napisakaluja/kefobiligatimi.pdfIn PDF document text
    • https://s3.amazonaws.com/xukirizugukugi/33790545065.pdfIn PDF document text
    • https://21e323bd-7fdd-46e9-a6c7-4880e76d7610.filesusr.com/ugd/0a51c1_5617393a0591466cbd33a10f823e1c54.pdf?index=trueIn PDF document text
    • https://c301b42c-deab-4116-afcd-a09dd0728425.filesusr.com/ugd/4bb894_e9bef8da2ecf42d8a0f16c3c461e82d5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mejigavukolu/31404098908.pdfIn PDF document text
    • https://89f68ddc-9f98-4e60-8afa-3e0ca6603e9e.filesusr.com/ugd/4725f1_48a96431cc1b42df826f074bdbf5f5d3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/negonanopix/android_21_hair_xenoverse_2.pdfIn PDF document text
    • http://kibiviridox.epizy.com/how_to_use_blender_for_beginners_2020.pdfIn PDF document text
    • http://lojabupabavize.onlinewebshop.net/88761152246.pdfIn PDF document text
    • https://s3.amazonaws.com/numunenoji/netflix_app_for_older_ipad.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000146ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146EE 5256 bytes
SHA-256: 903de8af6d0a902b22f575cb7a7b56fff84d243562e0dd6ecc39046ac20a0b0f
font_01_sfnt_off000158d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158D0 11832 bytes
SHA-256: 3c7dd7de0239e7bc16cd41cc69fdd97c36e100389bb299b38b4d8f87e6b0f3c9

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