Malicious PDF — malware analysis report

Static analysis result for SHA-256 f816b61bdcb798b6…

MALICIOUS

PDF

84.1 KB Created: 2021-04-03 21:19:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da17a4826d0025a00f4a7564b11c3fe5 SHA-1: 836f84e59c4cc000aa2691b76754a4487860bbba SHA-256: f816b61bdcb798b6a6798482c5264e145e68660067b4056723df175905e9df8c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1105 Ingress Tool Transfer

The PDF contains a lure related to checking COVID-19 reports online, which is a common tactic for phishing or malware distribution. It includes numerous external links, with at least one pointing to a suspicious domain (baarspo.ru), suggesting an attempt to redirect the user to a malicious site. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise 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://baarspo.ru/strik?utm_term=how+to+check+covid+19+report+online+in+bangladesh
    • http://kazexajisodibu.medianewsonline.com/second_hand_heart_line_dance.pdf
    • http://gatowixipeba.mywebcommunity.org/d20_call_of_cthulhu.pdf
    • http://vizilirudigub.getenjoyment.net/figuluxabatobesuwudu.pdf
    • https://cdn.sqhk.co/musutalivun/g4ghqjf/pot_stickers_recipe_in_air_fryer.pdf
    • http://vipadobotisituz.mygamesonline.org/mezozugupuvusilipuk.pdf
    • http://smirno.life/search_engines_information_retrieval_in_practice_free_download69nap.pdf
    • http://raisinsapp.club/how_much_foreign_aid_to_africa4ano5.pdf
    • https://cdn.sqhk.co/vekuperik/jdvohbW/kexiferixev.pdf
    • http://characduwe.space/definition_of_globalizationmfval.pdf
    • https://cdn.sqhk.co/pulovafafita/hhcjbCd/mukidajamalali.pdf
    • https://cdn.sqhk.co/joxusozomilo/g9Xhbje/police_siren_download_mp3_mein.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/ae257cf4-4248-4929-8746-d7b6f8cdd369/how_old_is_my_hotpoint_appliance_by_model_number.pdf
    • https://uploads.strikinglycdn.com/files/02dc0bb4-a8d2-469d-ba13-f5786a5195c7/what_are_the_examples_of_comparison_and_contrast.pdf
    • https://9c789f27-b70c-4c9d-9e83-211ee8f99b38.filesusr.com/ugd/bdeb4c_5dfbd21ef1e34a499e21d1684559810e.pdf?index=true
    • https://b89c0965-50b5-483f-b67e-52f573158f4f.filesusr.com/ugd/1e222e_ad252c11111e479390287eb2f655acc3.pdf?index=true
    • https://6baea7ca-81e4-4a11-8410-716433a99462.filesusr.com/ugd/764aaa_04c8a1b897554090a3910946a7840ac8.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1d732092-43ee-4da6-87c0-36d457ff519f/where_to_donate_used_baby_furniture.pdf
    • https://uploads.strikinglycdn.com/files/f08ed719-d283-4d50-88c0-054505d6bf8c/bryant_plus_90_furnace_will_not_ignite.pdf
    • https://uploads.strikinglycdn.com/files/4184c5a3-ac32-4640-bec1-79a2e57ba7e1/sivufiwokonabidarafo.pdf
    • https://uploads.strikinglycdn.com/files/f5cda22d-4c99-4605-8220-22f8cae30803/data_warehouse_concepts_design_and_data_integration_week_2020.pdf
    • https://f7690f66-1871-4559-97e0-239dee5b15da.filesusr.com/ugd/d2cc1f_c805f112df3b4269a2ec39bb1d3c2480.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc5b.bin
3ca40e9d19b936045e9ba1f347bbb3071d68c5c99806ea2df3761439e542117e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5B 5648 bytes
font_01_sfnt_off00010f8e.bin
a870773d3609b50cd24ce0b070dec3cda6a6e34e3b3561e904b82f386d62d46d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F8E 10752 bytes
font_02_sfnt_off0001344e.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1344E 4324 bytes

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