Malicious PDF — malware analysis report

Static analysis result for SHA-256 da37c9897f6bae1a…

MALICIOUS

PDF

86.6 KB Created: 2021-07-22 00:12:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 2345d78c0bbd72b6bc7b260f51bc905e SHA-1: 37657d1d23133402ef82e58bbf2627eb5391869a SHA-256: da37c9897f6bae1aac5119073484d6c1f42cb871f3bc5707be42dc664bf7109d
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including ML and ClamAV, as malicious and phishing-related. The 'PDF_SEO_UTM_REDIRECTOR_LINK' heuristic indicates the presence of a lure for free downloads. Although the document body is heavily obfuscated, the embedded URL points to a redirector that likely serves malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://feedproxy.google.com/~r/sq/ugae/~3/-MXWpcYQ7kA/square?utm_term=how+to+remove+security+settings+on+pdf+without+password PDF link annotation
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f6503d132d7d1ce062f318/1626755133692/79041159296.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f88c84c339af15f88b0ce2/1626901636370/cool_intro_templates.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ee558527fa864c7d13428c/1626232197581/good_natured_meaning.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60ec90525338e9546e47d4bb/1626116179089/how_many_carbs_are_in_a_bottle_of_champagne.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f028e0c57e07264c22ebf0/1626351840579/bush_furniture_assembly_manuals.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60f2259bdeec58162022ac48/1626482075835/robozisumenudixap.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac52a97a1d73ddacfe14c/t/60f5e76c8aebd160acdcd5a4/1626728300745/70713334592.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f88af1bdf15a01f206d997/1626901233844/so_this_is_christmas_piano.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60ee7c77114e6b7b7dea57ad/1626242167698/gefemegexerogukogomubopu.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f31a136c177f33d79fb9c2/1626544659206/wonuveraxufixelifagaxowa.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac4e0d5abe22cec5c4b22/t/60f11e52e9ec2a4c2bd9709c/1626414675272/tedizikadusozedefitiwaxa.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf69b23f3791685666e32d/t/60edf018a4137771ba040f2f/1626206232634/perineoplasty_before_and_after.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6c89a2b0b938881bcf91/t/60f0fca396ce9b33d72e9bf0/1626406051454/51010080735.pdfIn PDF document text
    • https://static1.squarespace.com/static/60aac59fb7e9621e2f466549/t/60edbd52737a545c5f45c500/1626193234149/tony_tan_caktiong_history_of_his_business.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6cad3a95e91b59aa2418/t/60ec867cdcef4a49b3ab2584/1626113661011/tiny_blood_vessel_in_the_body.pdfIn PDF document text
    • https://static1.squarespace.com/static/60bf6bff0d8d387fecc8b153/t/60f88d59accc405b10babd42/1626901849708/21632053683.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E9 11380 bytes
SHA-256: a61c9358abdf48600a1863899e7e42be943f332806cde73d9e6694215aca37d2
font_01_sfnt_off0000fe65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE65 1728 bytes
SHA-256: 164b17f13be751c428b8a7847bfef4401e4c17c2bf41cfc2fceec83f5d69c6ba
font_02_sfnt_off0001069a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069A 16692 bytes
SHA-256: 66e35d238428a3846cca9e405f646d5be7e09c9b494a33bb4bfc0c1efd3196a2
font_03_sfnt_off0001324f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1324F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1