Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d8a657a950d9669…

MALICIOUS

PDF

81.7 KB Created: 2021-04-01 12:43:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 96be83481b62f0bc00ce38d6582688a4 SHA-1: 182e1bec3af4272a7a8060d32e4874e93a81100e SHA-256: 7d8a657a950d96696d9f036acc8c2b2553c2b9f43a6b073dc70bfcb20dc69828
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated and point to other PDF files, indicating a link farm or SEO poisoning tactic. The primary URL suggests a lure related to home humidifiers, but the overall structure and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of techniques used to redirect users to malicious sites for phishing or malware distribution.

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://jacksth.ru/strik?utm_term=are+whole+house+humidifiers+worth+it
    • https://cdn.sqhk.co/vorinugobol/jcibiid/vawogizenigimudukup.pdf
    • https://cdn.sqhk.co/koditisalupe/gihdjjJ/movie_maker_programs.pdf
    • http://novazeku.mygamesonline.org/hartung_s_astronomical_objects_for_southern_telescopes.pdf
    • http://womizepivilora.sportsontheweb.net/refuw.pdf
    • http://wumiwuzigimo.mywebcommunity.org/jofoxotusajikina.pdf
    • https://cdn.sqhk.co/bapisolel/Wjcieg2/online_airtel_dth_recharge_login.pdf
    • http://ratedewu.scienceontheweb.net/adverbs_in_english_grammar.pdf
    • https://cdn.sqhk.co/jisaside/hagCib7/matheson_park_miami_fl.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zutugidod.onlinewebshop.net/2012_dodge_avenger_sxt_hp.pdf
    • https://a6668164-4238-4e0d-addb-cc4c62f58fca.filesusr.com/ugd/2dfcca_459610d269ec4dde955391493e63689f.pdf?index=true
    • https://47c0d0ed-94e3-447f-940a-e265262d053f.filesusr.com/ugd/a43ec6_3036e47766924ac080f37d7680f1d688.pdf?index=true
    • https://uploads.strikinglycdn.com/files/08900c91-1117-4b6d-93c1-162cce06542d/35961622784.pdf
    • https://uploads.strikinglycdn.com/files/b034f1d4-a0ff-403f-8551-4714d5701ea9/hp_cp1525nw_maintenance_kit.pdf
    • https://uploads.strikinglycdn.com/files/882a3980-8521-459a-ba04-dae6e5f69aba/39905278577.pdf
    • https://uploads.strikinglycdn.com/files/426560bb-e962-4f54-8d3d-a243dce2ab98/18612786132.pdf
    • https://uploads.strikinglycdn.com/files/7235e8e0-6eb5-4d6a-8555-c4704f88d9fa/bamuzetezus.pdf
    • https://uploads.strikinglycdn.com/files/02189f82-48c1-4ac1-a1a0-e6a104ab0bc0/how_to_read_an_ekg_for_beginners.pdf
    • https://uploads.strikinglycdn.com/files/1b33373f-472f-4915-a3cd-f3182d2c7d7f/find_google_play_music_files_on_phone.pdf
    • https://dba0ca6b-c979-46b3-87c9-041648dee063.filesusr.com/ugd/6f58fb_e78e8967cd7f46e0b817682e1ad27c93.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0c1af97d-79f7-495c-bb50-24b233843576/ziwiwoguv.pdf
    • http://gumomexad.onlinewebshop.net/barclays_bank_application_form.pdf
    • https://uploads.strikinglycdn.com/files/1b3b332a-6fc4-45cd-a48d-19dee710fd2a/juboku.pdf
    • https://b6c9d0de-81a1-4db9-ab7d-8a95af9e63d6.filesusr.com/ugd/b28ae2_8cc58b8a2cc246878ab3250fe4e8cfa6.pdf?index=true
    • https://caf0f927-206f-4b4e-aa34-0dd3da53679b.filesusr.com/ugd/83d902_99531d173c76416dac32ae49479bdeea.pdf?index=true
    • http://diwavubodinaroj.myartsonline.com/28076387209.pdf
    • 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_off000100c1.bin
27fbec91e4e87b01f804f599b65582c25dc2f32e8c3a83ffa51295e8a4cdd8f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100C1 5020 bytes
font_01_sfnt_off000111ba.bin
47309248e2228f7f2ee401a1197ff733da74c4e276a19a94f8ec7a0b0ca8c77f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111BA 11556 bytes

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