Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdf36648241838d5…

MALICIOUS

PDF

76.3 KB Created: 2021-03-27 22:07:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 96401114690e48b7908f2be7d5e23552 SHA-1: 110b530e865bcf62e0679930b583bdfa0a3535a4 SHA-256: bdf36648241838d512cd8298333a65cdab974eb3adf7d8c1d221ea96943f1033
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it contains a large number of external PDF links. One of the primary URLs, 'https://maypoin.ru/award?keyword=agriculture+college+in+maharashtra+pdf', is directly associated with a PDF_URI heuristic. The PDF_SEO_LINK_FARM heuristic further suggests a deliberate attempt to create a link farm, with 'http://fasevofal.epizy.com/lumewokilumu.pdf' being a prominent example. The document body is heavily obfuscated and appears to be a byproduct of the wkhtmltopdf tool, offering no direct textual clues about the lure. No scripts were extracted from this sample.

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.
  • 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://maypoin.ru/award?keyword=agriculture+college+in+maharashtra+pdf
    • https://vidanametok.weebly.com/uploads/1/3/4/3/134318125/4868332.pdf
    • http://mimasajikataza.iblogger.org/tipuzubuginirafirexoj.pdf
    • https://gozezitigaja.weebly.com/uploads/1/3/4/3/134340412/87530f31b6a0.pdf
    • https://tojewenegekov.weebly.com/uploads/1/3/4/5/134502344/panalira.pdf
    • https://peniseguj.weebly.com/uploads/1/3/2/7/132712198/9600839.pdf
    • https://gozezitigaja.weebly.com/uploads/1/3/4/3/134340412/c8c5ad446ec.pdf
    • http://xogefod.iblogger.org/is_cloud9_good.pdf
    • https://lidoxuma.weebly.com/uploads/1/3/4/5/134584164/xonufuvilifaso.pdf
    • https://sasogobol.weebly.com/uploads/1/3/4/3/134387633/putanikeluxowi_guxatokunazano_wowez_zavipexuli.pdf
    • https://fufosasoxesa.weebly.com/uploads/1/3/2/7/132740234/zivus.pdf
    • https://wesedujixezibo.weebly.com/uploads/1/3/1/6/131606467/3506953.pdf
    • https://zabugejagovim.weebly.com/uploads/1/3/1/6/131637755/didosonipoxawox.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://fasevofal.epizy.com/lumewokilumu.pdf
    • https://952d9f4b-853a-4e85-af28-23c4d489d487.filesusr.com/ugd/8db125_603310ae38574e62affa6188182ea178.pdf?index=true
    • https://77701ba7-c5ad-4750-ab17-5b03548f7fc0.filesusr.com/ugd/9a242c_b543e2833f1b47c2b40505833297a4a8.pdf?index=true
    • https://182222a4-a7a4-434f-839c-7103b506edb5.filesusr.com/ugd/224a67_654e185af359438b8b3be485efb21b74.pdf?index=true
    • https://uploads.strikinglycdn.com/files/fa89364e-e723-4836-b781-d3f5911c695b/60567119208.pdf
    • https://c2267750-1f6d-4c2f-944a-eb302c7f07d7.filesusr.com/ugd/93971e_ae0b2fc5c7bc486e8beb1279b6f2f477.pdf?index=true
    • https://b2d1eea7-aef5-47fc-962c-88b5513ecafc.filesusr.com/ugd/3a57bc_0d28cb87e454438280eac14ea1362104.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c70bbc35-c006-47c2-8b89-9a473e971bbd/how_do_i_become_an_international_lawyer.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2d5.bin
86cdb821bd4192ae056f6fa3bf198b745452908b55dc8a6a0e901aad97719b55		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D5 5440 bytes
font_01_sfnt_off0000f51c.bin
3abb83eb06664a29bbca68704017fc894e3791015dbf7eae6fbc9ba0ab6d9d35		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF51C 10352 bytes
font_02_sfnt_off000118b5.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118B5 4324 bytes

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