Malicious PDF — malware analysis report

Static analysis result for SHA-256 4639ace53dc1c5ae…

MALICIOUS

PDF

79.1 KB Created: 2021-04-01 04:38:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 768bd148e52664e342667418226925e8 SHA-1: d64a60cb3a62f4d14d4679d0eb2d9d29163e13d8 SHA-256: 4639ace53dc1c5ae0cc138dafc05a024a8e3b19881e7bc8bc213bbe5aad625f6
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for link farms and phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. The embedded URLs, such as 'https://mezovuduw.ru/wix?keyword=multiplayer+apk+games+via+hotspot', suggest a lure to download potentially malicious content or engage in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://mezovuduw.ru/wix?keyword=multiplayer+apk+games+via+hotspot
    • https://cdn-cms.f-static.net/uploads/4461249/normal_604e758159cf6.pdf
    • http://nozuzatu.22web.org/26605737013.pdf
    • http://menetufebev.22web.org/4_square_antenna_controller.pdf
    • https://static.s123-cdn-static.com/uploads/4450721/normal_5fe3a59c157d2.pdf
    • http://soxiwokix.iblogger.org/paxuf.pdf
    • https://static.s123-cdn-static.com/uploads/4412570/normal_5fef503bacafd.pdf
    • http://xunajoza.22web.org/76764913875.pdf
    • https://cdn-cms.f-static.net/uploads/4375531/normal_602e79c9ac552.pdf
    • https://cdn-cms.f-static.net/uploads/4421639/normal_6029330246565.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f0ce4c5b-2e67-46e7-b062-8fdd9697c2bf/maytag_dryer_wont_start_just_clicks.pdf
    • https://63c5840e-267c-49ed-94d3-fc9f9d8b9c0b.filesusr.com/ugd/8c5bc8_1dae27bfa6e1492fb42012e89546c386.pdf?index=true
    • https://d70b1dc8-7d09-4148-9854-e6a7cae1b87b.filesusr.com/ugd/5899d5_54d1720a703c4768bcf36ab7a70f0602.pdf?index=true
    • https://0ecef3a8-5193-4df1-8dcb-1b7dd0f2be2a.filesusr.com/ugd/e6092c_559ffc12069740a7ae79ad4fc974ebb3.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3485a408-0295-4747-a7d8-e2869e85d89e/dodenoja.pdf
    • https://uploads.strikinglycdn.com/files/786e361f-6665-4309-a2fe-d5301ba45dc5/danby_kegerator_dkc146sldb_parts.pdf
    • https://uploads.strikinglycdn.com/files/f8434d20-ad1b-4899-a875-0e9dad359063/lenovo_t430_docking_station_monitor_not_working.pdf
    • https://uploads.strikinglycdn.com/files/009cc591-f417-4d4e-b245-7861a422e462/how_long_do_you_cook_a_pork_loin_roast_in_a_pressure_cooker.pdf
    • https://uploads.strikinglycdn.com/files/af27a3e8-3e6e-4d43-a9a6-032bf435c1c5/jatidojusozujelenetokid.pdf
    • https://4fdc5cb1-0646-4ed0-9ac1-f9332ff2c333.filesusr.com/ugd/9b9480_2110bd5fb5ab45ac9dfa362f0e9a399c.pdf?index=true
    • https://45f61934-b4a1-4335-a9e3-e142d9465b5b.filesusr.com/ugd/0dd040_102dfdf96387478e9db8fba6eda51fac.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7f4991b2-ab28-4b3e-adb6-dfc057f8c151/how_do_you_calculate_the_average_density_of_the_earth.pdf
    • https://uploads.strikinglycdn.com/files/e771bf03-eaa5-4707-b8bc-3852a4aff004/61270090970.pdf
    • https://uploads.strikinglycdn.com/files/b4f51ff5-7d41-4a5b-97dc-30d87ecf02d6/kinov.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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f626.bin
85c777dbea6a559a11c7973f46cdd2eece749371925cd82ab1be0861dd3551a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF626 5464 bytes
font_01_sfnt_off000108ad.bin
5bf19a77422058208645afc40df0d98eb58e6ac7ff5d99870d166995a192ba4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108AD 10648 bytes

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