Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3658c75fbdba1f3…

MALICIOUS

PDF

91.5 KB Created: 2021-03-15 09:02:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 989c27ea45a5ba8aaf7ff415233389a7 SHA-1: 4f68a85e5aed6a42ee2072417eded7a271ae4c86 SHA-256: e3658c75fbdba1f3b992e34292e6832990af5ad4efcc62695b3f54ef3d012aa0
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious document activity, likely related to spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • 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 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://leonvi.ru/strik?utm_term=monitor+session+1+source+vlan PDF link annotation
    • https://cdn.sqhk.co/wituruxa/hff7hiA/rudemizabuzopomavijimope.pdfIn PDF document text
    • https://cdn.sqhk.co/bitowiso/awidjgw/velesevozulujejofi.pdfIn PDF document text
    • https://cdn.sqhk.co/wepunajexiju/icibk1G/55630002461.pdfIn PDF document text
    • https://fejilexa.weebly.com/uploads/1/3/1/1/131163980/1262750.pdfIn PDF document text
    • https://cdn.sqhk.co/kepozote/gjm8ifX/chikki_recipe_in_english.pdfIn PDF document text
    • http://viniveba.mywebcommunity.org/hp_elitebook_8570p_not_charging.pdfIn PDF document text
    • http://rixagidezexun.22web.org/reduce_file_size_mac_free.pdfIn PDF document text
    • https://cdn.sqhk.co/woberimi/YaTiggj/the_shadow_sun_apkpure.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414488/normal_6033c3685efb2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383681/normal_5ffd5ba3309a9.pdfIn PDF document text
    • https://cdn.sqhk.co/fafaviwi/hckoby4/76960608574.pdfIn PDF document text
    • https://cdn.sqhk.co/rapigufagi/KLjdicy/37814342390.pdfIn PDF document text
    • https://cdn.sqhk.co/navimoxa/f0ghjif/dexikov.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422372/normal_5fde3b2184eeb.pdfIn PDF document text
    • https://nogudoge.weebly.com/uploads/1/3/4/0/134017621/jilusetipejab-xurelidukuri-pevumo-xupanegij.pdfIn PDF document text
    • https://wobosiwax.weebly.com/uploads/1/3/1/6/131607505/luwazuzekoj.pdfIn PDF document text
    • http://jepewadagamer.scienceontheweb.net/oreck_xl_canister_vacuum_cleaner.pdfIn PDF document text
    • https://motovatexasej.weebly.com/uploads/1/3/4/9/134900011/nutojif-fegikiroliluze.pdfIn PDF document text
    • http://kepukarob.sportsontheweb.net/how_much_can_a_writer_earn_in_india.pdfIn PDF document text
    • http://fogepadive.iblogger.org/ge_carestation_650_user_manual.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vulopekusape.atwebpages.com/how_to_turn_off_blinking_red_light_on_nec_phone.pdfIn PDF document text
    • http://tudexobus.rf.gd/90820874442.pdfIn PDF document text
    • http://womepulus.epizy.com/lubowofejerubegotavox.pdfIn PDF document text
    • http://dapizodipe.myartsonline.com/bopexezajopawuvawopozer.pdfIn PDF document text
    • http://walaratetev.epizy.com/44709988266.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2E 4908 bytes
SHA-256: 41d935063e3620fb2d7aeea537df2f49902acc91d5f698838f911acc8fc6fc1a
font_01_sfnt_off00012006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12006 12768 bytes
SHA-256: f9d7184610df441c2886ba2d6acd1dc6b4ad8b70ade93e99ce222350e303aa9d
font_02_sfnt_off00014946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14946 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd