Malicious PDF — malware analysis report

Static analysis result for SHA-256 1015e0e86bb06e21…

MALICIOUS

PDF

102.3 KB Created: 2021-04-28 05:40:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 40439004770fa32bb30c5c545cb86d69 SHA-1: 7c1a7134ae522962465db34707267b29be9ecc7a SHA-256: 1015e0e86bb06e21ffea48dbe1cc06fb04a8223080dcbd60c16dbbc0c88d815a
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 PDF files hosted on S3 buckets, suggesting a link farm or SEO poisoning attempt. One of the primary URLs, 'https://midufefew.ru/strik', is likely a malicious landing page designed to trick users into believing they are viewing search results. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://midufefew.ru/strik?utm_term=how+to+find+out+if+tivo+has+lifetime+subscription PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4386073/normal_5fdff2850d0fb.pdfIn PDF document text
    • https://bosudire.weebly.com/uploads/1/3/4/4/134456289/lexonujebefo.pdfIn PDF document text
    • https://fibimijisu.weebly.com/uploads/1/3/4/4/134461798/lirokobixag-debideki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420776/normal_5fe8df806d7c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500877/normal_60372894057c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477156/normal_5fd274fa85c4f.pdfIn PDF document text
    • http://imkl-checker.com/samsung_55_inch_4k_curved_tv_85006ruut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405420/normal_602ac0f3dc7b1.pdfIn PDF document text
    • http://photoforce.ru/zewidonegosovolu9bl.pdfIn PDF document text
    • https://jedinelig.weebly.com/uploads/1/3/5/9/135982929/629c925.pdfIn PDF document text
    • https://duvigefotazepex.weebly.com/uploads/1/3/0/7/130775674/d0e1e35.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372373/normal_5fdbdc819a278.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449421/normal_6002631ee4d43.pdfIn PDF document text
    • http://operationhomeplate.com/9984019355igf5v.pdfIn PDF document text
    • https://fajagewuw.weebly.com/uploads/1/3/4/3/134350503/jafatevibafegis-jizitusaguvasu-vosilegexofexo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/xoferuzu/90145086801.pdfIn PDF document text
    • https://s3.amazonaws.com/woxorojero/impressed_by_crossword_answer.pdfIn PDF document text
    • https://s3.amazonaws.com/gogunabones/wetizavosagekevug.pdfIn PDF document text
    • https://s3.amazonaws.com/jewizopukuni/contact_details_card_template.pdfIn PDF document text
    • https://s3.amazonaws.com/vofadoloves/oscilloscope_application_android.pdfIn PDF document text
    • https://s3.amazonaws.com/kiwopusafize/counting_numbers_1-_10_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/mojivikapeti/varujuz.pdfIn PDF document text
    • https://s3.amazonaws.com/dumupa/jekumurogudu.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001227b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1227B 5532 bytes
SHA-256: 08636d2299a3483f4ef18f4fd6e45bf973bb4e051ba6c494b60ee9be2f588f7a
font_01_sfnt_off0001351d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1351D 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_02_sfnt_off00013dab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DAB 11508 bytes
SHA-256: 540ef39ed3597c0a664cae7af52007427ecf6ea6c1dcc6febdf1786846ccfd02
font_03_sfnt_off000164ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164ED 16340 bytes
SHA-256: ee51351c9eb8c6a9dbff1bb743467f39bbaa64eee970481c040e8f02c1ffc4b8
font_04_sfnt_off00017a65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A65 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3