Malicious PDF — malware analysis report

Static analysis result for SHA-256 aada68e3ddefa8ab…

MALICIOUS

PDF

94.4 KB Created: 2021-04-04 09:14:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7358c1b341390cae1bff724188ac795 SHA-1: e699bed441bdb0af95d4c0a8a76c1989c994a7b1 SHA-256: aada68e3ddefa8ab66c0a12b2b2993af959861f78bfa1f6284737f86394be446
156 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a phishing or SEO spam campaign, evidenced by the 'Amazon prime a star is born' lure and a large number of external links, many of which are likely part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to distribute further malware or lead users to malicious websites. No scripts were extracted, but the PDF structure itself is suspicious.

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://druttle.ru/wix?keyword=amazon+prime+a+star+is+born
    • https://cdn.sqhk.co/kulobibab/vXhfgiS/best_traditional_archery_shooting_glove.pdf
    • https://cdn-cms.f-static.net/uploads/4462694/normal_60466231c45e6.pdf
    • https://cdn.sqhk.co/dutebevon/fgchc9B/horizon_credit_union_macon_mo_routing_number.pdf
    • https://cdn.sqhk.co/baruduwege/nhaicjg/the_diplomat_apartments_columbus.pdf
    • https://cdn-cms.f-static.net/uploads/4410954/normal_6019c9b9b7631.pdf
    • https://cdn.sqhk.co/kekelivig/dAZicjf/land_rover_defender_2018_for_sale.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/popilo/avaya_1416_digital_handset.pdf
    • https://d86ad34a-7df2-4f47-937b-a12ab5abc0fa.filesusr.com/ugd/8cbfce_d8b335e05c1e400ab839f5093103af97.pdf?index=true
    • https://f9c380c0-3c9a-404e-8c76-a924832b335c.filesusr.com/ugd/9c8fb9_d5ff57c07b40407aa87667b620956446.pdf?index=true
    • https://6200e599-3f2f-4e3e-ab45-e6977ed7e777.filesusr.com/ugd/f8de3e_f4ffca4086d442a3b2f8cc5113430d46.pdf?index=true
    • https://s3.amazonaws.com/remeranexe/developer_apple_s.pdf
    • https://s3.amazonaws.com/foneniz/34280403608.pdf
    • https://3491c55f-27e3-40bb-839b-e55f5d2a6f06.filesusr.com/ugd/d14465_850751ee745e4963833956bd8aab221f.pdf?index=true
    • https://s3.amazonaws.com/jajoxulabojaso/91036347120.pdf
    • https://s3.amazonaws.com/jitimesolagun/does_a_lit_review_have_a_conclusion.pdf
    • https://8c1dc56a-a131-4b43-acff-3635b9115217.filesusr.com/ugd/90423f_6b20e65a58674d26a3d87189ad2c3aa3.pdf?index=true
    • https://48e4e0df-78ce-4736-8797-27735e68dc67.filesusr.com/ugd/f3b179_8cd1fdb8d6b146b9a6ad7227728d16ca.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
stream_002_off0000c7e7.bin
0deda157ce38103593edb013d0bdb8224d02b3114d1363fe827fb7d179970699		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xC7E7 36180 bytes
font_01_sfnt_off00013742.bin
0fead78b1446f568a338fdf0ad22a385beda38c45c944a52f1ac7cf3941c1a48		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13742 5112 bytes
font_02_sfnt_off00014883.bin
05976e44c905a9ae4f9a13888a1011d7c6f713cd0b0368eb8b9775c08f2d8e86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14883 10012 bytes

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