Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbf8e0ebf1734e27…

MALICIOUS

PDF

98.0 KB Created: 2021-02-26 05:37:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 4997a8a53ced3bfa5543ba69df805762 SHA-1: addb9dad65a304043add4302adb00fa0ff8daf10 SHA-256: fbf8e0ebf1734e27af743ffd6ac9f4bb6c2de53fec1d700b7f1ed4932a5d521b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/wix?keyword=surah+yaseen+pdf PDF link annotation
    • http://porn77.design/29018094802u4v8t.pdfIn PDF document text
    • http://goossyy.online/ark_breeding_mutations_guideii6em.pdfIn PDF document text
    • http://juwupexutaval.mywebcommunity.org/how_to_check_toner_level_in_brother_printer.pdfIn PDF document text
    • https://cdn.sqhk.co/sidogorego/d78heie/legendary_sword_mod_for_mcpe.pdfIn PDF document text
    • http://sajitalunaded.22web.org/99855275810.pdfIn PDF document text
    • http://lnstagram-copyright-confirms.com/bahubali_1_songs_telugu_free_320kbpsb1ycz.pdfIn PDF document text
    • https://cdn.sqhk.co/tisufupujeli/uhhvjib/flow_free_level_3_9x9_classic_pack.pdfIn PDF document text
    • https://cdn.sqhk.co/dekavaka/biekiff/superhero_that_runs_really_fast.pdfIn PDF document text
    • http://dle-tpl.site/speed_queen_stackable_washer_and_dryer_setipeab.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
    • https://s3.amazonaws.com/lanaladu/firefox_app_store_for_jio.pdfIn PDF document text
    • http://vizawog.epizy.com/dunkin_donuts_butternut_munchkins_recipe.pdfIn PDF document text
    • http://duwemanuwixam.atwebpages.com/flysky_fs-i6x_simulator_cable.pdfIn PDF document text
    • http://jiwunix.epizy.com/how_do_you_cite_a_television_interview_in_apa.pdfIn PDF document text
    • http://nowivopikuzud.epizy.com/nozozanegesulevisanon.pdfIn PDF document text
    • https://s3.amazonaws.com/xozeb/90371788044.pdfIn PDF document text
    • http://pijularof.epizy.com/free_powerpoint_templates_for_english_teachers.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00013287.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13287 31488 bytes
SHA-256: 710f41df6f13da0722b19f3ebf5e5fd46b05951364efc34c0fb68ff0e3e964db
font_00_sfnt_off0000fe9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9E 4948 bytes
SHA-256: 314b504ffb9beba4be224b37bceb260b5c0a026f01ea4889446bf4446565f106
font_01_sfnt_off00010f5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5A 10208 bytes
SHA-256: ea44d7e52b16469a9c784ba423334b8610d18be774f33f18afd680eeecb53b3e
font_03_sfnt_off00016c3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C3C 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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