Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5da09cdac1f706a…

MALICIOUS

PDF

80.6 KB Created: 2021-06-05 06:34:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4443ec2a4bc4a1328505dbafa6d89297 SHA-1: 5a694744875536986edc841efbbcd859409b9b00 SHA-256: c5da09cdac1f706aa6ed4fc56d30299d5e49f195e93ebaaec0eb843c83747e8e
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 SEO spam or phishing. One prominent URL, 'https://wastran.ru/pbw?utm_term=download+brawl+stars+mod+apk+version+32.1701', suggests a lure for downloading a game mod. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://wastran.ru/pbw?utm_term=download+brawl+stars+mod+apk+version+32.1701
    • https://cdn-cms.f-static.net/uploads/4471474/normal_5fd7389506b2b.pdf
    • https://xalerozezuw.weebly.com/uploads/1/3/5/3/135343063/ketame.pdf
    • https://sasasukaga.weebly.com/uploads/1/3/4/6/134624721/305b1778da1d.pdf
    • https://cdn-cms.f-static.net/uploads/4366048/normal_603508f780882.pdf
    • https://static.s123-cdn-static.com/uploads/4461777/normal_5ff6247f8b84b.pdf
    • https://cdn-cms.f-static.net/uploads/4459328/normal_5fe6e140c1ef9.pdf
    • https://burojexadolej.weebly.com/uploads/1/3/4/1/134108553/8292823.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/6803d0e1-30c8-45bd-b101-699376d627bc/how_much_is_corolla_in_nigeria.pdf
    • http://gatunam.pbworks.com/w/file/fetch/144529674/jawahar_navodaya_vidyalaya_result_2017.pdf
    • https://uploads.strikinglycdn.com/files/9bf7c0f4-aace-4604-a155-645fe1671c5b/beats_studio_3_review_2020.pdf
    • https://uploads.strikinglycdn.com/files/c321f62c-a527-4cd8-a3ef-2463339253d4/amapiano_sample_pack__free_flp.pdf
    • https://uploads.strikinglycdn.com/files/7c014d29-ebe2-48a0-86d3-40d5f9891d40/571686965.pdf
    • http://silasofinat.pbworks.com/f/jonathan_livingston_seagull_test_questions.pdf
    • http://mogulazedub.pbworks.com/w/file/fetch/144523752/78927381981.pdf
    • http://xigivesupi.pbworks.com/w/file/fetch/144591285/18429290057.pdf
    • https://uploads.strikinglycdn.com/files/e2c14563-0fd8-4ac8-9d6e-dc87c172b6ad/motorola_radio_holders_police.pdf
    • http://banusiv.pbworks.com/w/file/fetch/144441570/volume_of_cube_and_cuboid_worksheet_with_answers.pdf
    • http://letonepamusi.pbworks.com/f/94170386088.pdf
    • https://uploads.strikinglycdn.com/files/33b05137-57da-4ec1-8592-dd35637e9bbd/5943817199.pdf
    • https://uploads.strikinglycdn.com/files/63f5d90a-2ac8-4809-b10a-0b8dd6b7969f/who_is_in_the_cast_of_coming_to_america_2.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5b0.bin
b0bb5fb2923a5085caab606cb29eb0cb26b5de48961925bf31df4b6edfa87d1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B0 6060 bytes
font_01_sfnt_off0000fa5f.bin
58baee13b942185231606b1d7a6fec12f44d28237bab91ffa8d970ea4c4f8e3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5F 10752 bytes
font_02_sfnt_off00011f59.bin
a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F59 16204 bytes

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