Malicious PDF — malware analysis report

Static analysis result for SHA-256 a90134479b01fd13…

MALICIOUS

PDF

80.8 KB Created: 2021-04-01 00:26:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 16af07ca6ebefd7c1d9d4786fea78502 SHA-1: ce53c359bcef185d673bb497db673183561f30d9 SHA-256: a90134479b01fd132843fabc73b640e4c050cce693b30169f654ece6873efbf6
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as a phishing trojan by ClamAV and an ML classifier. It contains a lure related to 'how to gift partnership interest' and redirects to a suspicious URL. The presence of external URIs and the ML detection strongly indicate a malicious phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://bologen.ru/strik?utm_term=how+to+gift+partnership+interest PDF link annotation
    • http://legumajati.22web.org/21450605457.pdfIn PDF document text
    • https://cdn.sqhk.co/gibuburi/zHgjxjd/pulse_pressure_meaning_in_nursing.pdfIn PDF document text
    • https://cdn.sqhk.co/zowonefaso/he0Vhii/burger_time_arcade_game_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/gixedomawa/YcShiPn/lighthouse_movie_streaming.pdfIn PDF document text
    • https://cdn.sqhk.co/zowolanazew/Ahfuhc5/zivewanedotedarifupap.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451021/normal_5ff3c473ef097.pdfIn PDF document text
    • https://cdn.sqhk.co/jatobeguji/jjQghgg/copy_of_birth_certificate_ohio_cuyahoga_county.pdfIn PDF document text
    • https://cdn.sqhk.co/tuxonewebuke/ghajfWY/13597989160.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455375/normal_6056c6568cefd.pdfIn PDF document text
    • https://cdn.sqhk.co/xipepovivik/ghihFjc/55614429521.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451575/normal_5fc87f09b284b.pdfIn PDF document text
    • https://cdn.sqhk.co/bojowagawire/gcUdZhe/demet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393889/normal_5ffc3723a1038.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379848/normal_6005222a52864.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393772/normal_6006ebfcca58d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://vutikasozimot.epizy.com/antrenmanlarla_matematik_4_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/tinezedu/ngt_bivvy_light_manual.pdfIn PDF document text
    • http://bizepusozuj.epizy.com/software_espiao_android_grtis.pdfIn PDF document text
    • https://s3.amazonaws.com/fojaxexino/how_do_you_find_the_density_of_water_with_temperature_and_pressure.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxawetawupo/line_graph_report_writing_sample.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f26d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26D 4972 bytes
SHA-256: a84f2634e4640dde5a76ecd5992f1a1c13cec3bc994a848d244e8e959f8342b5
font_01_sfnt_off0001035c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035C 10832 bytes
SHA-256: a3139272bdede8b85d860ae2bc4a16ab646bad5b0d21d7aec84d161391aba526
font_02_sfnt_off000127d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127D3 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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