Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7bb78eaf7bb69d2…

MALICIOUS

PDF

81.5 KB Created: 2021-03-24 10:54:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4a27d6a018973c3c6306e0e6008b756a SHA-1: 9163dd5b02ef89a737b7b1f95884945178d6db32 SHA-256: c7bb78eaf7bb69d239d54bdba0c740e94bbbbaeb70cb669f07243571b1dc7c34
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains a large number of external links, many pointing to PDF files, suggesting a link farm designed to distribute malicious content or redirect users to phishing sites. The presence of embedded URLs and the overall structure strongly indicate an attempt to lure users to external, potentially malicious, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://jumiwimov.ru/wix?keyword=wild+ginseng+prices+2015
    • https://cdn.sqhk.co/dopuwene/XZsgfhb/jewuvawupapovarade.pdf
    • https://cdn.sqhk.co/gufojakig/gKyrjhy/begiluv.pdf
    • https://cdn.sqhk.co/bebomopakax/Zhihgif/how_to_slice_iceberg_lettuce_for_burgers.pdf
    • https://cdn.sqhk.co/xuxinugad/URf34hi/7053509542.pdf
    • https://cdn.sqhk.co/rifasidajika/ijhfXha/20361983584.pdf
    • https://cdn.sqhk.co/noremixujor/ZiejcE2/basketball_legends_unblocked_88.pdf
    • https://cdn.sqhk.co/duditizonut/b5Mhg11/zizeludixadubovula.pdf
    • https://cdn.sqhk.co/korebuxaguz/fS6jhie/sirurit.pdf
    • https://cdn.sqhk.co/nifodotiriru/ihjbjeN/94335049333.pdf
    • http://zonerokemub.getenjoyment.net/blue_line_library_schedule.pdf
    • https://cdn.sqhk.co/potekovibe/cicgiye/84002530348.pdf
    • https://cdn.sqhk.co/ziriziwebu/rggiiMZ/48033792203.pdf
    • https://cdn.sqhk.co/vitimosugu/geYOIih/bounce_back_loan_scheme_facility_letter_meaning.pdf
    • https://cdn.sqhk.co/dikapagoloza/Rhhpzjp/crazy_high_school_football_plays.pdf
    • https://cdn.sqhk.co/gasubapo/hjgebpG/road_champs_mxs_track.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sipanokule.onlinewebshop.net/vetazavijenisoxemuk.pdf
    • https://aabf49e0-5477-4fd2-8456-a986ef8f2a87.filesusr.com/ugd/9e14ca_dc07c9dac21149e7bd688b20aff5b0c1.pdf?index=true
    • https://s3.amazonaws.com/debiwelof/66697777335.pdf
    • https://s3.amazonaws.com/posaxugidut/13394346852.pdf
    • https://c2963e02-5f2a-49ff-bb4d-22715b80ab3a.filesusr.com/ugd/55efe4_af6c2c8c73f34ed0a717dd1904e8d6c6.pdf?index=true
    • https://57933e30-1e86-4cbe-ad2b-777cb72f9932.filesusr.com/ugd/235f1a_245b0ff966524bea9a488a035ee7f28e.pdf?index=true
    • https://s3.amazonaws.com/sivanira/xadesaxanezolumozi.pdf
    • https://02314edc-d025-420b-9d62-795437f25c47.filesusr.com/ugd/4f0fc1_da6872d03d9b433c8e20de811275fa63.pdf?index=true
    • https://b56e00ce-d729-42e9-814b-b9a4b194f5ba.filesusr.com/ugd/f6f93f_1ea6576993d640ca81af3a2c5a4dac36.pdf?index=true
    • https://s3.amazonaws.com/lazesej/vdrl_ka_full_form.pdf
    • https://s3.amazonaws.com/sosupejuxofedo/kifemasumodurige.pdf
    • http://buzumigasox.myartsonline.com/25216677326.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_off0000fd11.bin
d366de0b27c45a38bda40c1a1f3a5351a4452c975d324757b387d7505148496c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD11 5492 bytes
font_01_sfnt_off00010ff6.bin
cae3d35969310a0d2350319778467d225312a37c6ae93b65bf4c363fde9c9df0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF6 11688 bytes

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