Malicious PDF — malware analysis report

Static analysis result for SHA-256 4136649d492bb6ad…

MALICIOUS

PDF

85.9 KB Created: 2021-03-18 04:16:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 64b68b9e3991dadb5e8be9ba5e7e108f SHA-1: 6beceda9103d53eeb68889e4e3caf7e6b421b2a5 SHA-256: 4136649d492bb6add567b53d0fa66eb4e7d35fff704f53615868cd3e1054d609
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection to malicious content. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the embedded URLs are the primary indicators of malicious intent, likely serving as a lure or a gateway to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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.
  • 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://fokemale.ru/strik?utm_term=house+of+night+other+world+series PDF link annotation
    • https://zimolitavok.weebly.com/uploads/1/3/1/8/131856331/kijajima-venagaxanem.pdfIn PDF document text
    • https://pugubitef.weebly.com/uploads/1/3/5/3/135302221/9691330.pdfIn PDF document text
    • https://mopotiwifatuge.weebly.com/uploads/1/3/0/8/130813373/cabb7318eb.pdfIn PDF document text
    • https://tuwoganerolet.weebly.com/uploads/1/3/4/6/134631505/nunewud-dodupolibajelaj-valewoga.pdfIn PDF document text
    • http://xokoden.22web.org/18275486190.pdfIn PDF document text
    • https://tipozuroboga.weebly.com/uploads/1/3/4/2/134265922/molugiviz.pdfIn PDF document text
    • https://cdn.sqhk.co/fesakesovoka/jcje4xh/darodunovalasuvol.pdfIn PDF document text
    • https://cdn.sqhk.co/vanewano/crzhgib/grand_central_terminal_nyc.pdfIn PDF document text
    • https://bakuwosir.weebly.com/uploads/1/3/0/8/130874569/lutidukikifujaxiver.pdfIn PDF document text
    • https://cdn.sqhk.co/sekigizakeku/Cmcgghb/4537212975.pdfIn PDF document text
    • http://wewedaz.iblogger.org/java_callback_android_example.pdfIn PDF document text
    • https://subokolabipu.weebly.com/uploads/1/3/2/3/132303028/demajevuxufojajurop.pdfIn PDF document text
    • https://jetosopotow.weebly.com/uploads/1/3/4/0/134018613/pavaba_mevixajigo_geletonijuj_sosoteru.pdfIn PDF document text
    • https://cdn.sqhk.co/raxinosi/shaic9D/makojamiborun.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fomaralunex/43660394123.pdfIn PDF document text
    • https://s3.amazonaws.com/vinejivunitego/xasafib.pdfIn PDF document text
    • https://s3.amazonaws.com/sedimeraxufi/wevalamidorulazopu.pdfIn PDF document text
    • http://bofekid.epizy.com/what_is_the_best_height_for_a_table_saw.pdfIn PDF document text
    • https://s3.amazonaws.com/zafirawit/advena_apk_offline_mod_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/pobizilufevim.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001122f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1122F 5012 bytes
SHA-256: 0049aef9f5215800c3cdb3982a2ba700fda59fee9e0d88d5ad31b452e6c1dacb
font_01_sfnt_off00012346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12346 11368 bytes
SHA-256: 2dd24ae494d6b6122e4a1d8efd12257d997c4f2a90a9810fa5770e6f5375f725

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