Malicious PDF — malware analysis report

Static analysis result for SHA-256 3158b879e09acc85…

MALICIOUS

PDF

81.1 KB Created: 2021-04-03 06:35:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 2881cdebb4856566f14c966593fe922a SHA-1: b85d9bba01d012fbd1956108e3e6ef55ab38d102 SHA-256: 3158b879e09acc859b288addebb074ea679c923a9b0f087836dc673461e75157
164 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://druttle.ru/strik?utm_term=cbse+class+10th+english+book+solution PDF link annotation
    • http://chtotakoeverti.biz/fukeziminusifr9fe2.pdfIn PDF document text
    • https://cdn.sqhk.co/tetolonul/e2dUMlF/dirty_cartoon_stickers_for_whatsapp.pdfIn PDF document text
    • http://stickerrus.ru/19696683023nru7i.pdfIn PDF document text
    • https://cdn.sqhk.co/zejizoguzut/heehdid/16652994147.pdfIn PDF document text
    • https://cdn.sqhk.co/zezinojox/Olhifii/19685892606.pdfIn PDF document text
    • https://cdn.sqhk.co/nobukomorur/Y7jjZib/reweboxonibumadotubomel.pdfIn PDF document text
    • https://cdn.sqhk.co/lebogomatoze/jKjfidg/tobotav.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/CtjdgtM/fast_money_halftime_report_cnbc_fix.pdfIn PDF document text
    • https://cdn.sqhk.co/niserutom/jehajhh/banco_do_brasil_pessoa_juridica_abrir_conta.pdfIn PDF document text
    • https://cdn.sqhk.co/lejesapazud/6Tlli8I/jamaica_news_radio_station.pdfIn PDF document text
    • http://chelamela.org/nerozaborekirakunp2fs.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://ec08fec6-e576-400d-8504-372613838d3c.filesusr.com/ugd/57e0ce_dad95e94f6e842d9ba2013fdb6f1bc7d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd234a69-d840-4e0a-a9e5-0f8b91804a46/watch_to_kill_a_mockingbird_online_free_full_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b4c5c0c-e9f2-4175-8ce5-56406e94f327/92216157292.pdfIn PDF document text
    • https://c4cd0dbc-23d7-4f11-b65f-2561cec8abe5.filesusr.com/ugd/516793_9d64ce2ed41a490eb34f6df1f343a1d7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b185e5a-a0b6-4b83-848a-7a418ca1e15b/34667866226.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4fe984c-ffaa-4ffc-ac29-2fbccd4eb938/77726460910.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b8ed356-a904-48ce-80af-af88fb918cb3/jotevisa.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF293 5268 bytes
SHA-256: 71e2f81738cb101b477de9a5a2365c71508da14a9864738f3940eaff39c723b3
font_01_sfnt_off0001047d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1047D 10576 bytes
SHA-256: 865c1c13e5291323821cae3cf77ff34c597fedc19ac09d438bfd763f829b43b0
font_02_sfnt_off0001288b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1288B 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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