Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b44d7624c345cf4…

MALICIOUS

PDF

80.7 KB Created: 2021-05-03 20:46:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 51d26db881f8dac85d34bfbefdd9e456 SHA-1: 44b2d8e60ddbe8d6ce5df5f29ec24b356da048e3 SHA-256: 6b44d7624c345cf407dacd7d48f8fa9f174051459febbb449bb84abd29931b52
156 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 phishing attempt. ClamAV also detected it as Pdf.Phishing.Trojan. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs indicate malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://crophysi.ru/strik?utm_term=how+much+are+afge+union+dues
    • http://podarokinsta24.online/angels_stadium_seating_guide71f3f.pdf
    • https://xaduvipejejex.weebly.com/uploads/1/3/4/6/134631107/nowaredopixak.pdf
    • https://static.s123-cdn-static.com/uploads/4375209/normal_5fdd345b73d70.pdf
    • http://puzufogekok.22web.org/automates_programmables_industriels_2e_dition.pdf
    • https://junobinedutuki.weebly.com/uploads/1/3/2/7/132712306/zupomoxala.pdf
    • https://lifunakejeka.weebly.com/uploads/1/3/4/3/134358873/kowuwalapof.pdf
    • http://fulokixowo.scienceontheweb.net/what_are_the_different_versions_of_cards_against_humanity.pdf
    • https://static.s123-cdn-static.com/uploads/4454668/normal_5fc62bc83dfcc.pdf
    • https://static.s123-cdn-static.com/uploads/4382187/normal_5ff393b58fd19.pdf
    • http://finipupote.mywebcommunity.org/how_long_does_it_take_to_study_medicine_in_spain.pdf
    • http://duwinijuj.mypressonline.com/10493281031.pdf
    • https://cdn-cms.f-static.net/uploads/4454432/normal_606dff7d58416.pdf
    • http://nenidegelivon.22web.org/identifying_sentence_errors_grammar_worksheets.pdf
    • http://about-central.com/75313527200lulb7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://duwimufowewis.epizy.com/a_simple_favor_book_plot_summary.pdf
    • https://s3.amazonaws.com/muvemasoxaji/xaveboroxikuzix.pdf
    • https://s3.amazonaws.com/wupixufekijax/missing_angles_worksheets_year_6.pdf
    • https://s3.amazonaws.com/rewepalazamiso/how_do_i_clean_my_holmes_humidifier.pdf
    • https://s3.amazonaws.com/wobuzisibal/alter_ego_plus_a2.pdf
    • https://s3.amazonaws.com/sakaburepagase/positive_psychology_online_course_harvard.pdf
    • http://jadukubilelib.myartsonline.com/pobitog.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_off00010123.bin
271ccce74250e176bc1ba9756f7614f14d745be6459c245ec4bced3eafa00c95		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10123 5456 bytes
font_01_sfnt_off0001139b.bin
37a2edac6676bed1e7b831bdb631b5a333d494c833577012a65fd585a395808a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1139B 10020 bytes

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