Malicious PDF — malware analysis report

Static analysis result for SHA-256 622bd75c91302b78…

MALICIOUS

PDF

77.3 KB Created: 2021-03-31 22:04:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 03ad01e412712956eb86f2e66587fbdb SHA-1: 6372b9c9b55eb5398a9bb88435f270890eb9b55f SHA-256: 622bd75c91302b7881ce61ff5ac12197309c83ef77bc8cac8d451620d36f2b2b
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded URLs suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://soxebez.ru/123?utm_term=jquery+ajax+form+submit+loading+image
    • http://veronaital.space/40448927910cauyk.pdf
    • https://kufesivewafe.weebly.com/uploads/1/3/1/3/131384244/tasemi_gofumazukuv_rubezux.pdf
    • https://cdn.sqhk.co/loziromegon/ieJFSid/classification_of_organisms.pdf
    • http://hugertely.xyz/how_to_reset_password_on_adt_alarm_systemblnlf.pdf
    • https://cdn.sqhk.co/nupozifulija/ieGIlOa/89717650967.pdf
    • https://cdn.sqhk.co/zupololano/F8jeggk/lovecraft_country_cast_episode_6.pdf
    • http://filmera.ru/what_is_sales_best_answercuzjg.pdf
    • https://cdn.sqhk.co/kukusagufo/fCgcWig/49889401542.pdf
    • https://cdn.sqhk.co/pometobab/gJiia8p/prince_dress_up_nz.pdf
    • https://mogarujatokeduw.weebly.com/uploads/1/3/5/3/135324664/didoputajanubed.pdf
    • https://cdn.sqhk.co/momujolo/kQgcmJ4/outbreak_prime_jumping_puzzle.pdf
    • http://tublitalia.space/12191811079d9uku.pdf
    • https://cdn.sqhk.co/jutalufelex/qjjhlgj/bass_boost_equalizer_settings_android.pdf
    • http://differencecheats.net/79929783591cl9jw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://55f5e71c-5f54-469f-9449-301c43944234.filesusr.com/ugd/bbdb65_502967253ee9430ba3072745ba2374f7.pdf?index=true
    • https://s3.amazonaws.com/muwemivumazulax/cnc_fanuc_programming_software.pdf
    • https://b67fa923-03b4-4d21-b555-95ff628d7525.filesusr.com/ugd/1d4b90_747941f3339148b99cde026a04c5ac6a.pdf?index=true
    • https://s3.amazonaws.com/moduxanakuri/the_negotiable_instruments_act_1881_notes.pdf
    • https://s3.amazonaws.com/xukirizugukugi/68905467569.pdf
    • https://a82c121c-2200-4cd7-aff6-47cf910fdadb.filesusr.com/ugd/117c17_62d40a689828423cab786fa004016fa9.pdf?index=true
    • https://8964868a-aef6-4da0-9a9b-29de7c28e0c5.filesusr.com/ugd/b910ae_f4b885f8637248caa8619b5c423d7e9f.pdf?index=true
    • https://s3.amazonaws.com/zewimu/new_cv_template_2018.pdf
    • https://790985df-dfec-4a08-b509-00f37668cf87.filesusr.com/ugd/a421e3_243863ccfc9d43419c1fdf69053d3d82.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e909.bin
e1b44dfc96b3434dd20ab8157d53c6b26ebe821fceab7b45a96b3e1a9e103417		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE909 5728 bytes
font_01_sfnt_off0000fc82.bin
1d5a4546f520aae468aa4b6c704f1b4e6dc243862572281e546e594dc3733a67		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC82 12192 bytes

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