Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fb71e0ea9ed771b…

MALICIOUS

PDF

82.1 KB Created: 2021-03-20 14:46:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 1cb3bdf23efc7ec2f79aac2ecc01a281 SHA-1: d893e8afe8cbefc2e4ecc15175dd30cb40b6e26b SHA-256: 8fb71e0ea9ed771b8a01b7db7c4d5a29e283ac4f91829ed1120eada0533caa22
196 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing or trojan. It employs SEO link farming and redirector techniques to distribute further malicious content, disguised as academic papers. The embedded URLs and the document's structure suggest an attempt to trick users into downloading additional malicious files, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/award?keyword=greenhouse+effect+essay+in+english+pdf PDF link annotation
    • http://xidasetetobuge.scienceontheweb.net/81311712929.pdfIn PDF document text
    • http://newberginvestmentproperty.com/the_sims_mobile_free_download_apkqbhde.pdfIn PDF document text
    • http://shopyou.online/nunegujufizevz1.pdfIn PDF document text
    • http://slmit.space/sudisipiwedibabepajs2wf6.pdfIn PDF document text
    • http://ripugusulufiluj.getenjoyment.net/26272192023.pdfIn PDF document text
    • http://slmit.space/skylanders_superchargers_wii0eqvo.pdfIn PDF document text
    • http://justamorem.com/fajavugizezanigogakiveq7b5w.pdfIn PDF document text
    • http://forkidsshop.online/zomaripuzapumimivovala22ndo.pdfIn PDF document text
    • http://fazejajogavu.medianewsonline.com/mubujaxejasozodijina.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/fujadabez/will_disney_plus_stream_on_samsung_smart_tv.pdfIn PDF document text
    • https://s3.amazonaws.com/lekezaru/how_to_solve_nash_equilibrium_3x3.pdfIn PDF document text
    • https://s3.amazonaws.com/wuniku/iso_games_for_ppsspp_emulator_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jedaxopopuko/kidney_function_lab_report.pdfIn PDF document text
    • https://s3.amazonaws.com/bitajemisajoz/84237100300.pdfIn PDF document text
    • https://s3.amazonaws.com/lejivugeleguwod/dell_r740xd_owners_manual.pdfIn PDF document text
    • http://xutenujute.myartsonline.com/63959930537.pdfIn PDF document text
    • https://s3.amazonaws.com/fukezavazuj/acbrandres._dll_64_bit.pdfIn PDF document text
    • https://s3.amazonaws.com/lumixi/beche_thakar_gaan_video_song.pdfIn PDF document text
    • https://42172c5f-463d-425f-bc49-3536d5e9b788.filesusr.com/ugd/3e9aab_a10065103dbd44d4b722a897d5e0082c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xubifupi/pubimulojusivuzojid.pdfIn PDF document text
    • https://535a9070-e28a-464b-adc5-c02ad08be00b.filesusr.com/ugd/9df9d6_fe9399732dc64176b14b54b0bbcf1f5a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rimejiguvif/tanakunaf.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_off00010328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10328 5548 bytes
SHA-256: f005677449ee95f1f7ed1793c4438ff70dd31777a4aa30a9aefb3e419362b88e
font_01_sfnt_off0001160f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1160F 10640 bytes
SHA-256: 3080a791a13c3cada1fffdc3eacba150b1cac0f254856a0c8d6bbf775d6f6ab2

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