Malicious PDF — malware analysis report

Static analysis result for SHA-256 816da61951bcb7e2…

MALICIOUS

PDF

81.2 KB Created: 2021-03-13 23:11:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: caa7655fa86810ccb616690724bab04b SHA-1: 1f3e6bc21c6f43cefc6223b895a46ef5601e9747 SHA-256: 816da61951bcb7e2d260d2091a585a1420bf2fc57b323e7fadcaa0221c65d5f9
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection to malicious sites. The ClamAV detection and ML classifier also indicate malicious intent. While no scripts were explicitly extracted, the presence of external URLs and the nature of the heuristics point towards a phishing or malicious content delivery mechanism, potentially initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://nipisod.ru/strik?utm_term=what+is+the+periodic+table+worksheet+answers
    • http://want-seo.ru/wink_live_apk_mod_coinu1l5f.pdf
    • http://help-verification.com/bootstrap_div_class_form-_groupncr57.pdf
    • http://govnososal.xyz/wosewebubaswbp2u.pdf
    • http://ovca.space/shock_hipovolemico_fisiopatologiackug5.pdf
    • http://love-your-lips.online/30129963380jlvpm.pdf
    • http://datinge.site/como_evaluar_el_liderazgozsy6i.pdf
    • http://rawenspant.online/lowanasi6lfb7.pdf
    • http://igcopyrightforhelps.com/145922572804bzxn.pdf
    • http://onlinetyz.xyz/what_kind_of_oil_goes_in_a_2012_hyundai_sonata59joo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://58eafb2e-ea74-4523-a1b2-d2e0fe9bfe54.filesusr.com/ugd/466fa0_16d2dfae3dac4d80a53ac297a02b9035.pdf?index=true
    • http://jasagedonemope.epizy.com/99234491769.pdf
    • https://uploads.strikinglycdn.com/files/2dc1ec0f-2bb2-400c-ab8d-f96308bc31d3/englander_pellet_stove_manual_55-shp10.pdf
    • https://04934832-22f3-474e-96de-b9d593e92251.filesusr.com/ugd/f390e7_03ac3ef4d10c4caeac7ac219c65d6eb6.pdf?index=true
    • https://5a1138df-423b-4a5d-a7c7-36223740754e.filesusr.com/ugd/a72fa8_78ace68894b04c0b9598c08cfd917c08.pdf?index=true
    • https://8eeb1f0a-0cdd-4c66-98a4-83777b49fb54.filesusr.com/ugd/64f9d2_08d4de5419fc40f5a2efb6dcec99b1d4.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e5ca26a4-1db0-4a69-906f-2988021e9841/weapons_of_mass_instruction_review.pdf
    • https://0c17d2ad-06a2-4efd-9128-26148cac6670.filesusr.com/ugd/44320b_074d875aa0014090afc640b46cbe86bf.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0f6a341f-8246-4a07-83a0-e36eddcb9f85/29516834782.pdf
    • https://uploads.strikinglycdn.com/files/c9b39a2a-8ea8-47a9-a309-c433d64f1393/50403257758.pdf
    • https://921790ca-7b53-43bd-a25d-275d6f056404.filesusr.com/ugd/9d24cb_b9c78516d547442da77aa1b83e62ee7a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/72f1ebdc-fffd-42d4-b607-46629cd388ec/korean_from_zero.pdf
    • https://e216d865-ddc7-438b-99b2-64609380b1bb.filesusr.com/ugd/7ae8b3_c9768778e752407ca2a1415fd7c2a6d9.pdf?index=true
    • http://jiwenufaxo.epizy.com/arkansas_secretary_of_state_franchise_tax_report.pdf
    • https://71347f20-8353-4153-bebc-dd2a28b3a5cf.filesusr.com/ugd/a382ee_e4261f87f1174e1f9591b1b16820ef9a.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_off0000f20d.bin
1b66a469ed67ef61177d07007b5dde121aca747a67c631ae1f124a8ea570135c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF20D 5256 bytes
font_01_sfnt_off000103f0.bin
f5b794e91744551e46531d6dfc49049d7bed2e2664c316f68a83329a6580de5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103F0 10896 bytes
font_02_sfnt_off00012926.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12926 4324 bytes

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