Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bab6f089bf0a51b…

MALICIOUS

PDF

81.2 KB Created: 2021-03-13 16:11:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7005a7fb6861451040b79cea38a80762 SHA-1: d2e7855c8e5627fae2eb99fa93a91188f95c97aa SHA-256: 6bab6f089bf0a51bb785b09e35f256a67dd9045d069babb8785d6dbfa3be0f97
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 of which are likely malicious, as indicated by the 'PDF_SEO_LINK_FARM' heuristic and ClamAV detection. The embedded URLs suggest an attempt to redirect users to potentially harmful sites for phishing or other malicious activities. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/123?utm_term=beautiful+butterflies+pictures
    • http://usechambre.xyz/what_is_the_term_for_the_graphical_addition_of_two_vectors1gham.pdf
    • https://cdn.sqhk.co/xijisejes/xoommgi/wumalo.pdf
    • https://cdn.sqhk.co/lozukoxokir/g11nidV/11263262279.pdf
    • http://lnstagramsupportingcenter.com/x-_men_apocalypse_movie_in_tamil_freewpemn.pdf
    • http://futup.ru/mata_ke_bhajan_video_meinjb8uq.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c5fe6582-7a8f-4cf4-96cf-c0f70e10e6c0/listen_the_art_of_effective_communication.pdf
    • https://s3.amazonaws.com/kegubinefuda/37475834046.pdf
    • https://fed4949e-3809-4fc0-a28b-84c5d390f589.filesusr.com/ugd/94482e_c0150da4432243c19af79faecb2efe92.pdf?index=true
    • https://178c1879-e916-404b-9861-a2431bd0f83a.filesusr.com/ugd/1aace6_b2d28e0a143a475083bca928dac3c080.pdf?index=true
    • https://s3.amazonaws.com/miledu/why_the_magna_carta_is_so_important.pdf
    • https://uploads.strikinglycdn.com/files/2865aaa0-5508-4c60-b8f1-9fd4d3011727/do_you_like_green_eggs_and_ham.pdf
    • https://99516632-72ce-40f3-a9a1-a01c91361c65.filesusr.com/ugd/e42c35_50432fc06460494baf65a38be6fb9915.pdf?index=true
    • https://80c93ba6-74df-4afb-9852-3a83eaba20e3.filesusr.com/ugd/4cf28d_2ef0335fa15a4e50802d2caedeac92a6.pdf?index=true
    • https://fb9345b8-40be-4608-a8ff-9c5427dba92f.filesusr.com/ugd/98d639_3c414e8560594803ba4d3f240231d3c3.pdf?index=true
    • https://aece7fbc-7072-4055-9cfa-29e0da41b620.filesusr.com/ugd/e878fd_500eead454ec4a25be2c58182b2770ca.pdf?index=true
    • https://73856814-13bb-4d44-aeaf-752cce6ba6bd.filesusr.com/ugd/a0d21a_d16c52e89c43458899ffb21d1cd0c9da.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e69f.bin
a4e0b9c780fb47e7bbb897db1e8f574473f94baf21027f83a7c2a109598a911c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE69F 6552 bytes
font_01_sfnt_off0000fca4.bin
9cf24a082b678618e26319f0584598ed4e2e076efe2d8d60191dc71b00e3aa92		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA4 5200 bytes
font_02_sfnt_off00010e5f.bin
ffefe8694a56a41d4cd7f1b32e42758f6e5a4e559e75358d4f800bc50545bb20		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E5F 11504 bytes

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