Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2844067796d5bd5…

MALICIOUS

PDF

77.5 KB Created: 2021-02-27 19:11:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 75e8008caa031b98e6e7955df82ef52f SHA-1: 98c23ade6594816b80898d87896653569ecde6b8 SHA-256: c2844067796d5bd5db5f185d8731aa5fe6bb1cd4b0be3f3f9ec89865498e7fb7
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 high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' suggests the document contains a large number of external links, likely to manipulate search engine results or direct users to malicious sites. While no scripts were explicitly extracted, the presence of numerous embedded URLs and the PDF structure itself are indicative of a phishing or link-farming attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://resalured.ru/123?utm_term=difference+between+viral+and+bacterial+chest+cold
    • https://cdn.sqhk.co/dimumaneda/gehejag/71581006288.pdf
    • http://kipokefurur.mygamesonline.org/17450033074.pdf
    • http://kesuvajeb.scienceontheweb.net/missouri_charge_code_304.010.pdf
    • https://vebilikowuti.weebly.com/uploads/1/3/2/7/132740371/disirebanoxozo.pdf
    • https://cdn.sqhk.co/gabadifofibo/gjgiko2/15062511539.pdf
    • https://cdn.sqhk.co/furugilenu/cmjcgeW/63352843649.pdf
    • https://cdn.sqhk.co/giganopof/bOjgigd/303863706.pdf
    • https://limorevoxa.weebly.com/uploads/1/3/4/6/134611026/sutuf_dowol.pdf
    • https://sugowixo.weebly.com/uploads/1/3/4/5/134588459/ab41cf12df.pdf
    • http://talemine.getenjoyment.net/optiplex_755_usff_specs.pdf
    • http://kumululurug.scienceontheweb.net/44993365504.pdf
    • http://niburufajanuto.sportsontheweb.net/58734258790.pdf
    • https://cdn-cms.f-static.net/uploads/4480758/normal_60176e3482a53.pdf
    • https://cdn-cms.f-static.net/uploads/4420589/normal_601210fc53015.pdf
    • http://pigigozoruda.mypressonline.com/officejet_pro_8600_turn_off_fax.pdf
    • https://static.s123-cdn-static.com/uploads/4444353/normal_5feb3fa66320b.pdf
    • http://siviveko.getenjoyment.net/what_to_do_if_your_washer_doesnt_spin.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zubiluwetij.myartsonline.com/python_programming_book_in_hindi.pdf
    • http://newemepakirid.myartsonline.com/naloxodatiseduxuf.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_off0000f375.bin
a645aef346e1cba54e38932696f721106a21f3e45bff6bc57b65d5626d399d7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF375 5400 bytes
font_01_sfnt_off000105e6.bin
9b8b8efe5338de54edb0e84869574636c4e22f927ea32bf13f49989608c4075d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105E6 10136 bytes

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