Malicious PDF — malware analysis report

Static analysis result for SHA-256 27c08b20fa94abe8…

MALICIOUS

PDF

84.9 KB Created: 2021-03-08 21:56:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: c8ea04b5086e3cf4b16cd308558141ab SHA-1: 1af4f6f3b63d2c953afc5e287e4e6b2b1dd1d279 SHA-256: 27c08b20fa94abe8b7467074abf445caf39a8a547647eb3cfa1188495cb04647
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier, and it contains a large number of external links, many pointing to disposable domains. The document body, though heavily obfuscated, appears to be a lure related to "Seat of the soul chapter 12 summary", likely intended to drive traffic to these malicious sites. The presence of embedded URLs and the link farm heuristic strongly suggest a phishing or SEO poisoning attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://midufefew.ru/aws?utm_term=seat+of+the+soul+chapter+12+summary PDF link annotation
    • https://tibilizam.weebly.com/uploads/1/3/0/7/130775373/xirixisujesos_ronan_xukufukuxotixaj.pdfIn PDF document text
    • http://xarusogu.22web.org/beautiful_naat_sharif_audio.pdfIn PDF document text
    • http://jolujunutido.iblogger.org/introduction_to_arthropods.pdfIn PDF document text
    • https://xevibobi.weebly.com/uploads/1/3/4/6/134683071/58c9ee3c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502511/normal_6002ff1a8fa2e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421460/normal_5fc8542bca994.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386094/normal_5ff75b711e66c.pdfIn PDF document text
    • https://nazawerud.weebly.com/uploads/1/3/4/3/134353719/gopower.pdfIn PDF document text
    • https://dukinuvofipul.weebly.com/uploads/1/3/2/7/132711936/7657328.pdfIn PDF document text
    • https://jetisinodab.weebly.com/uploads/1/3/5/3/135335938/jukuxamew.pdfIn PDF document text
    • https://liduwofixuxobef.weebly.com/uploads/1/3/0/7/130739348/jorun.pdfIn PDF document text
    • https://tevaxuxelajuri.weebly.com/uploads/1/3/2/7/132712575/wotiruze-vurudazuxukox-xudam.pdfIn PDF document text
    • https://fokuxadeji.weebly.com/uploads/1/3/4/5/134585395/9159880.pdfIn PDF document text
    • https://basitonivi.weebly.com/uploads/1/3/4/5/134584834/4b0cc788d.pdfIn PDF document text
    • https://fekamudubop.weebly.com/uploads/1/3/5/3/135325245/zepeno_biwovabolovuge_jineraza.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tinivukedeta/lobusitugexefewatuvolix.pdfIn PDF document text
    • http://tafiwepamubov.atwebpages.com/resin_hedgehog_bookends.pdfIn PDF document text
    • https://s3.amazonaws.com/bufexa/brushed_cotton_sheets_next.pdfIn PDF document text
    • https://s3.amazonaws.com/napisakaluja/lurojirupif.pdfIn PDF document text
    • http://zakefuki.myartsonline.com/mebopebusapanuxinavisagum.pdfIn PDF document text
    • https://s3.amazonaws.com/dewazewokib/abba_knowing_me_knowing_you_sheet_music.pdfIn PDF document text
    • http://tekoboworitutew.epizy.com/instrumentation_books_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zowibatev/sample_marriage_biodata_format_for_muslim_boy.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD87 6548 bytes
SHA-256: a16d78b4e765d5ee2bbe34147faa0d9708ca9f4bd36cf3b090d8d65c0d41a973
font_01_sfnt_off00010dde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDE 5644 bytes
SHA-256: 37421864c57c5a0da6f4dea4afe40d33f08ab6576e74782a09d85c2fa3a5f8b0
font_02_sfnt_off00012100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12100 10356 bytes
SHA-256: 51f9bedc561e05563b84b9e66e5b0be6af9e658f833b01ea5c52ae9e3861c787