Malicious PDF — malware analysis report

Static analysis result for SHA-256 36041405b26697a0…

MALICIOUS

PDF

87.8 KB Created: 2021-04-06 23:43:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 47e05a4579d349ac2dbcf445fec19aba SHA-1: b4b30de99938faa4fc45bfd7ceb0c50a9fc7d2df SHA-256: 36041405b26697a0ab930cee68acfcf413c0485f633062dbf5abe5393bb7a2be
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to seemingly unrelated PDF files, indicating a link farm or SEO poisoning tactic. The primary URL, jumiwimov.ru, is likely a phishing or malware distribution site. The ML classifier and ClamAV detection strongly suggest malicious intent.

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://jumiwimov.ru/123?utm_term=arabic+vocabulary+for+beginners+pdf
    • https://bivapere.weebly.com/uploads/1/3/4/6/134689139/f68b20a6276cda8.pdf
    • https://zilavexeredora.weebly.com/uploads/1/3/0/8/130874610/zotujinunudul_sijesowopaxi.pdf
    • https://fetevemukimagon.weebly.com/uploads/1/3/4/8/134896640/1fe82871c5.pdf
    • https://bapefakujina.weebly.com/uploads/1/3/4/4/134483882/luzivuvojevasi-nusepewoveb-dirosoxe.pdf
    • https://nezuwiwobitedut.weebly.com/uploads/1/3/4/6/134600585/77ad22ee.pdf
    • https://wazurewimi.weebly.com/uploads/1/3/4/5/134598950/94a6d.pdf
    • https://letazofuwukuge.weebly.com/uploads/1/3/4/8/134869061/kojeputugux-sovemesupovidut.pdf
    • https://nironaguvotu.weebly.com/uploads/1/3/4/5/134530025/wizixojerevixiwejaju.pdf
    • https://gebiralegesexi.weebly.com/uploads/1/3/0/8/130814020/rajaru-wipal.pdf
    • https://fimupekegu.weebly.com/uploads/1/3/4/5/134502303/9887612.pdf
    • https://pazovazorukilaz.weebly.com/uploads/1/3/4/6/134673506/gagowefalodil_pugagonixurojem_gemamexar.pdf
    • https://tuwoganerolet.weebly.com/uploads/1/3/4/6/134631505/senugiminavab.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nabifovu/knights_and_dragons_armor_stats_spreadsheet.pdf
    • https://d0fd53c2-66a5-49f7-a942-a4bfc50892a3.filesusr.com/ugd/11baf9_067f2568647745e8822dc4dbe4e49b90.pdf?index=true
    • https://s3.amazonaws.com/gedexim/69032419294.pdf
    • https://e1cd7dcf-8988-4be8-9b1a-722367337987.filesusr.com/ugd/6203b9_fb5a0507bf264bbcb1f5345942d60239.pdf?index=true
    • https://b7d3a0ae-8059-487b-8826-088776693174.filesusr.com/ugd/8d23e4_6b9b716311b643f7b17774b74e72f076.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f54a.bin
cb199dc89648047c570285cfb091f79f24e87788dde2082d889d819970921866		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF54A 5616 bytes
font_01_sfnt_off0001087e.bin
251a2f4f4c4a76381eb99f81b8648b9923d8c9317ec4c29863ad6115ea680532		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1087E 3056 bytes
font_02_sfnt_off00011552.bin
0047d2b1435969806203e94fa823f5e7ac1634f458a4ee2d553ecd4059bd8b3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11552 10844 bytes
font_03_sfnt_off00013aa4.bin
55ee31f2b9c575572aca401957c5cf2f3b57b55b1dd57d1bb6d1e144d3512b41		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13AA4 16088 bytes

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