Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1d16089f9e330ec…

MALICIOUS

PDF

70.6 KB Created: 2021-03-14 17:31:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 839b037146d4e7025f4f41d50a19e5cf SHA-1: 123465b14d9d49d3857d0da2e589bb40424c11c1 SHA-256: b1d16089f9e330ecdf99e969490ceadacde21aec02f61f1a7637424d08059dcf
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by 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 0.9998

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.
  • 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://xajibur.ru/123?utm_term=little+rascals+free+hd+movie PDF link annotation
    • https://cdn.sqhk.co/fokatekox/QDyK8jb/fosuxogenu.pdfIn PDF document text
    • https://cdn.sqhk.co/wozovege/3jfhehh/63110854190.pdfIn PDF document text
    • http://a1metromovers.com/the_making_of_a_poemu33d8.pdfIn PDF document text
    • http://fabifux.22web.org/wiziru.pdfIn PDF document text
    • http://bu-markett.com/tuzutatodanaxoxon3wjmu.pdfIn PDF document text
    • https://cdn.sqhk.co/derilunadine/1Aghcit/zalevuz.pdfIn PDF document text
    • http://wapividazofar.scienceontheweb.net/65014671480.pdfIn PDF document text
    • https://cdn.sqhk.co/kujotukil/7ieJiil/transformers_robots_in_disguise_season_4_episode_1.pdfIn PDF document text
    • http://infonewsuk.site/lutron_caseta_wiring_guideyfid6.pdfIn PDF document text
    • https://cdn.sqhk.co/josipinu/kmEje34/disney_emoji_blitz_keyboard_full_access.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://positajugopisu.myartsonline.com/genie_garage_door_not_opening_with_remote.pdfIn PDF document text
    • https://s3.amazonaws.com/lupebesu/rrb_alp_cbt_2_syllabus.pdfIn PDF document text
    • http://vibirokudod.myartsonline.com/bobedikabosikaxovagosabi.pdfIn PDF document text
    • https://c0e8410b-c394-4b36-8083-179878a46647.filesusr.com/ugd/d4b1dc_20eb78e3a90749828159fe1f6181fb7a.pdf?index=trueIn PDF document text
    • https://8a89c5bc-485b-4808-980c-66c60e8d9908.filesusr.com/ugd/834936_9dcd3d90d0714066a349b92e1fa394ce.pdf?index=trueIn PDF document text
    • https://be8f41f0-9ddd-434d-ab6d-aa755a40b80d.filesusr.com/ugd/726d9c_73b6e834eabb4348b8c42b7c6377147a.pdf?index=trueIn PDF document text
    • http://kulaxukiju.epizy.com/install_play_store_apk_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/sedowedi/loditutuwipabujudurino.pdfIn PDF document text
    • http://ropupifalapoges.atwebpages.com/77871164098.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD489 5264 bytes
SHA-256: 7c87ebbf0d4d445a840b875afae01eca26c3a5ad92db2e7dbbfa177e6ad8c45d
font_01_sfnt_off0000e64b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE64B 11532 bytes
SHA-256: bbcbe2935c98bf988f778fae9c52a16fce63dd611e8351885c437dea02cc84e0

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