Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ef9e293dda53f31…

MALICIOUS

PDF

92.1 KB Created: 2021-03-17 07:09:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0906af166901e715d460626abe02ba32 SHA-1: 7fb1f004aeca578b6e79ee5f6942e5c4a06885a1 SHA-256: 4ef9e293dda53f31e0fb51d5ec14523aa9e6f042c60f607851c44f4a25226e01
156 Risk Score

Malware Insights

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

The PDF contains an embedded URL that advertises a "gems and resources generator" for Clash of Clans, a common lure for phishing or malware distribution. The PDF also contains a large number of external links, many of which point to other PDFs, suggesting a link farm or redirection mechanism. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://midufefew.ru/wix?keyword=clash+of+clans+gems+and+resources+generator
    • http://freedate18.xyz/comets_asteroids_and_meteors_answers2lc29.pdf
    • http://jifarobajis.sportsontheweb.net/how_to_download_music_in_itunes_for_free_in_iphone.pdf
    • http://creditreportfast.info/survival_food_kits_1_year4ij4l.pdf
    • http://dugarudewemudo.sportsontheweb.net/molarabegexefuzumiralu.pdf
    • https://rasofenetiko.weebly.com/uploads/1/3/4/8/134862321/lebode.pdf
    • https://vewenaloviriwu.weebly.com/uploads/1/3/2/8/132816087/zoderosaw.pdf
    • https://savatevadenu.weebly.com/uploads/1/3/1/4/131452836/kuzuraxaka-febewis.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://37bcb4aa-7747-4ff6-a352-0e22bf983c21.filesusr.com/ugd/4393d3_8c1d05656d044d9db8edb2711b61ace5.pdf?index=true
    • https://uploads.strikinglycdn.com/files/11ec444d-5195-401c-b2f3-61145ec5e004/netimow.pdf
    • https://uploads.strikinglycdn.com/files/fbccc0dc-c54c-48a4-ba88-a11dee719382/35367851995.pdf
    • https://d4180a97-8dd0-4bf1-9e2f-d1b128d1a64d.filesusr.com/ugd/ae059d_1a1627964184404b940e5a855b1b792f.pdf?index=true
    • https://a7193630-a032-4ee2-b136-33837135b76a.filesusr.com/ugd/fac845_1c71d9cf4bca4791a3c2074920017868.pdf?index=true
    • https://6205d428-d5dc-494e-bbc3-e2236f9d811e.filesusr.com/ugd/6885a6_097a3105f7594c60912bce49feef987b.pdf?index=true
    • https://2a983b51-2e13-4971-8c1f-a5bca3ab4353.filesusr.com/ugd/e1a791_c6c3319abb5c4fc1a5826aa2aafbaaeb.pdf?index=true
    • https://uploads.strikinglycdn.com/files/096b2966-466b-4cc3-8a36-4bcab828d11a/woguritiwivezoroxipezawez.pdf
    • https://5c90cfa9-af55-48e2-9430-1f3580382729.filesusr.com/ugd/e2b09b_f56ae454263649e19c3cccd5a88a736c.pdf?index=true
    • http://wuwedilejom.myartsonline.com/2013_jeep_grand_cherokee_key_fob_battery_change.pdf
    • https://uploads.strikinglycdn.com/files/f97ec60d-bd65-4fbe-842c-49627c878318/easy_healthy_smoothie_recipes_without_yogurt.pdf
    • http://namepafubi.atwebpages.com/how_to_make_a_real_christmas_tree_look_fuller.pdf
    • https://13adc596-845f-4f4a-b539-e2c04a0a4b5a.filesusr.com/ugd/6e2da7_d644cb3bd5d34e03a2ba37dca6985d62.pdf?index=true
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001078a.bin
c869623db2c05562498cc9cb1916016d1b91018bc87eafd1451c42a44441586e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1078A 5292 bytes
font_01_sfnt_off00011953.bin
a2b8316fac5e3df1af4967bf9e7a426505a2565298be2c84694a3a72ae368f1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11953 11136 bytes
font_02_sfnt_off00013f65.bin
31aa257675234f953cb39254c73a0c002637764ec2691c470e0912636c3685cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13F65 16204 bytes
font_03_sfnt_off00015493.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15493 4324 bytes

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