Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa5831a24c2901a7…

MALICIOUS

PDF

104.1 KB Created: 2021-04-08 02:55:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 54d61d80a35ff86436f46600fb55db52 SHA-1: 9dba30e0bc06cb39bfdea18ce09a8e9d05704353 SHA-256: aa5831a24c2901a731c00d665d21ac2c4c1144c01fbc8b943ecb6f8a719addcd
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. The heuristic 'PDF_SEO_LINK_FARM' suggests the document contains a large number of external links, likely for SEO manipulation or to distribute malicious content. The primary IOC is the external URL 'https://pelibifir.ru/strik?utm_term=how+to+say+goodbye+in+the+south', which is likely the initial landing page for the attack.

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://pelibifir.ru/strik?utm_term=how+to+say+goodbye+in+the+south
    • https://cdn-cms.f-static.net/uploads/4366313/normal_603ed7d134ab0.pdf
    • https://cdn-cms.f-static.net/uploads/4373986/normal_600bba9abdbe3.pdf
    • https://rifidikebipe.weebly.com/uploads/1/3/0/9/130969129/3190472.pdf
    • https://cdn-cms.f-static.net/uploads/4481675/normal_605c937e8c31a.pdf
    • https://cdn-cms.f-static.net/uploads/4529149/normal_6038912d5257c.pdf
    • https://static.s123-cdn-static.com/uploads/4387813/normal_5fdec8e59db59.pdf
    • https://dirixiganud.weebly.com/uploads/1/3/4/3/134321978/fanip-sabizatu-rutopuj.pdf
    • https://cdn.sqhk.co/lawafopugu/wMI7jjt/bingo_at_home_app_pattern.pdf
    • https://cdn-cms.f-static.net/uploads/4495254/normal_5fd979743b049.pdf
    • https://giravegide.weebly.com/uploads/1/3/2/6/132681237/48fb0f15349eacc.pdf
    • https://cdn.sqhk.co/sesumaku/h3QhiiX/chartek_7_technical_data_sheet.pdf
    • https://cdn-cms.f-static.net/uploads/4469136/normal_605c0aa11cf73.pdf
    • https://static.s123-cdn-static.com/uploads/4390641/normal_6007a506e015f.pdf
    • https://cdn.sqhk.co/pajubopolak/fzFCFgi/72702426206.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://f11c4bf2-12a6-49f8-9590-07a94b689168.filesusr.com/ugd/11276f_f506c7cde81a4c02b62d750435129e5d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/01191cdd-048f-4256-8892-cb14eaa82b4a/53_bank_holiday_schedule.pdf
    • https://uploads.strikinglycdn.com/files/a5bef90f-ca21-423b-ac79-e716046111aa/lubidelunuremapoduvazenod.pdf
    • https://uploads.strikinglycdn.com/files/f0abda4a-60e9-4898-8dbd-eea47ef74e55/mini_dvi_to_usb_c_cable.pdf
    • https://486a928f-df87-4682-b39c-9199637d78f9.filesusr.com/ugd/982a49_a5fa45b939a5408ca36f000503032d78.pdf?index=true
    • https://d78d2789-9aef-4bfd-88be-9093bec910ef.filesusr.com/ugd/87a178_0a75972ba3b84691b03b2ce60c0bd0c5.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e4b.bin
f43c0aa3f9685c1f87a88a887bd14b1b1a90d96e7372fa832f32c511467a696e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4B 7456 bytes
font_01_sfnt_off00012115.bin
442be6b37d1132b22bfc9fdc07b294514c394e6204342206ca2101c1c5372748		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12115 7024 bytes
font_02_sfnt_off000138be.bin
e79d34e52cac56c2a956f220a865971d3b111ac6565baf56a79cb14846709b88		 pdf-font-stream PDF embedded font (sfnt) at offset 0x138BE 5256 bytes
font_03_sfnt_off00014ab1.bin
285efa47c102a74404000dd8ba567f64ec8f023bc34e3251f31c86e9e26c649a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14AB1 15968 bytes
font_04_sfnt_off00017a98.bin
0f7cfda8de0ceb5bee05681d47874f9440859f334c05b07ede2fdb80ba944a77		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17A98 16672 bytes

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