Malicious PDF — malware analysis report

Static analysis result for SHA-256 69c23b8f2962d752…

MALICIOUS

PDF

104.3 KB Created: 2021-03-16 12:50:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 8f21db6731836ac275701860af7789b1 SHA-1: fc9115eb74a29f3c179d3b84592c71fd989e75ae SHA-256: 69c23b8f2962d75242e16670d14c07a2a123d5d41e167eb1828a739b6a1857f5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. These links likely serve to manipulate search engine rankings or redirect users to malicious sites. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body was heavily obfuscated, preventing a deeper analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://botokaw.ru/award?keyword=angle+addition+postulate+quiz+pdf PDF link annotation
    • https://cdn.sqhk.co/ditetona/gmgiGie/justin_bieber_friends_mp3_free_download.pdfIn PDF document text
    • https://xebikazogede.weebly.com/uploads/1/3/2/7/132740990/6c7477237.pdfIn PDF document text
    • https://cdn.sqhk.co/tezesafura/ZH3hegj/86568997291.pdfIn PDF document text
    • https://cdn.sqhk.co/duwenaxiseve/cJjcibi/one_piece_treasure_cruise_discord_free_gems.pdfIn PDF document text
    • https://cdn.sqhk.co/zinumazak/jdzgeXs/kutawuvevakewuvuzine.pdfIn PDF document text
    • https://wimelavejitovuv.weebly.com/uploads/1/3/4/5/134597731/wufav.pdfIn PDF document text
    • http://bumaga.bz/prayer_of_jabez_sermonj1u6k.pdfIn PDF document text
    • http://chtotakoebezuz.biz/nibanamovunitobilo71aq.pdfIn PDF document text
    • https://fizupubiwox.weebly.com/uploads/1/3/0/7/130775838/suxesipotu-pifisar-xiruwurutuvi-sugogikomotexax.pdfIn PDF document text
    • https://fotawadibegul.weebly.com/uploads/1/3/1/1/131163643/9326345.pdfIn PDF document text
    • https://voxisazemiruza.weebly.com/uploads/1/3/1/8/131871554/2981440.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/df9ed846-d973-4e59-a04c-0596f71b36a0/vusiridurifanezetoxes.pdfIn PDF document text
    • https://43a2ba88-5de9-465b-b95f-6a4d82f2d06e.filesusr.com/ugd/dcbeda_0e94b01898524199a91fef0e8d1209ad.pdf?index=trueIn PDF document text
    • https://451b78f8-089e-4d4d-bc4b-60abb621f7e6.filesusr.com/ugd/7ef0dc_d3a1f3cd454d434e971b16aaf70121de.pdf?index=trueIn PDF document text
    • https://7f3dc8b3-869c-44c5-82eb-14ae88d57796.filesusr.com/ugd/dc4ca1_a99ad49850bf4f3081b07a8f4676ce32.pdf?index=trueIn PDF document text
    • http://panejolaraluka.rf.gd/rugegukukazapopo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef3cd9ba-ed68-4d3b-8684-a9240652d0d8/neredekutoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb4c4df7-0bc5-47e7-aafb-c7d9f99ab1ea/finomafixebudiriwipemofe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06eae259-b81f-45c7-8b6a-b95495c8fa7d/70762567385.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bc3731b-f8e4-418d-a507-929525944388/82946629457.pdfIn PDF document text
    • http://tovimemiluv.epizy.com/66824832851.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14341 5276 bytes
SHA-256: cd7fe4371d05e8901c1ae49889a051f5b5ccf26411e97d7c0e368459bfc8fc41
font_01_sfnt_off00015553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15553 11444 bytes
SHA-256: ea53f9a22603ffa2b31ecd95342308b102dbd2d2bdf982708525f71aaefa65e9
font_02_sfnt_off00017c83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C83 16256 bytes
SHA-256: 17909d0e645fddc278ff7f1ee6272b5f41987f4da9265c1dfae8fc6b98a5d3c7