Malicious PDF — malware analysis report

Static analysis result for SHA-256 79407cb2bfbdd8db…

MALICIOUS

PDF

83.2 KB Created: 2021-03-21 05:47:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: ba667f46bc9ae1f38a9db08a25ebaef9 SHA-1: 52cdd11b967cb01c6a88a45e0684fac181eac1ae SHA-256: 79407cb2bfbdd8dbf6fbb2d93f517df4d30a63f6a59097af1a0105becfa021d8
186 Risk Score

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://jumiwimov.ru/strik?utm_term=what+are+the+theories+of+nursing PDF link annotation
    • https://tofabefanij.weebly.com/uploads/1/3/4/7/134726630/tevoguragifukik.pdfIn PDF document text
    • https://tigelulipuneve.weebly.com/uploads/1/3/4/7/134746657/254711b.pdfIn PDF document text
    • https://xanikijopido.weebly.com/uploads/1/3/4/7/134738407/565190eb.pdfIn PDF document text
    • https://cdn.sqhk.co/solijisivono/n0hak35/heartstart_hs1_defibrillator.pdfIn PDF document text
    • https://ragadavifomo.weebly.com/uploads/1/3/5/3/135306528/vebegevopevisusifuwa.pdfIn PDF document text
    • https://magalezofutik.weebly.com/uploads/1/3/4/5/134599277/mekevibuvifemo.pdfIn PDF document text
    • https://cdn.sqhk.co/xenotami/G8hcugc/false_positive_covid_test_email.pdfIn PDF document text
    • https://lafuxekezijunu.weebly.com/uploads/1/3/1/4/131406487/c639f.pdfIn PDF document text
    • http://rowowevu.mypressonline.com/19499683517.pdfIn PDF document text
    • https://vojutodebol.weebly.com/uploads/1/3/4/0/134096580/dedim.pdfIn PDF document text
    • https://wusedutewaxugag.weebly.com/uploads/1/3/1/4/131437839/2169737.pdfIn PDF document text
    • http://kunutudusoxa.mywebcommunity.org/wuzalivujasofirijew.pdfIn PDF document text
    • https://zebewanuvaxa.weebly.com/uploads/1/3/4/6/134613040/7c5f669a.pdfIn PDF document text
    • http://zitokujamu.mypressonline.com/68895599189.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/xijuxosisomuna/tofov.pdfIn PDF document text
    • https://2d841ef3-a248-4e6a-996b-2d54d6713fdd.filesusr.com/ugd/1decf9_e08ce20fb7d04124b8267540b765c22f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fotojipifuzitul/country_love_songs_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/fefurorobumi/do_you_have_to_do_morning_pages_in_the_morning.pdfIn PDF document text
    • https://s3.amazonaws.com/rikolesafuwofar/nalobe.pdfIn PDF document text
    • https://5a995288-ce6f-4ae3-a3e6-14272d8003db.filesusr.com/ugd/7be1cd_7dabcfb860c140148d2b5daf4b7ad69f.pdf?index=trueIn PDF document text
    • https://71bfc0c6-4bef-405a-aee6-9e9dcaab3d12.filesusr.com/ugd/708cfd_3cdf6e84f013477ba694eeb3f4f5ee77.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gonafoziguwewe/cerebral_venous_malformation_icd_10.pdfIn PDF document text
    • https://dec4a425-646e-450a-80ca-a73a75d058ad.filesusr.com/ugd/ba3095_f370f83fb45a480e91c10250fbd48674.pdf?index=trueIn PDF document text
    • https://7c9e9c40-2b96-4f88-8065-b5ff5e495659.filesusr.com/ugd/3bfcae_96a2f58e39934615b58fab5cd90edf47.pdf?index=trueIn 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD15 4892 bytes
SHA-256: 254c39d2647d91992cbd84b8a6bf96390f988569028b798f9042ae26cc571ace
font_01_sfnt_off00010dbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBE 10380 bytes
SHA-256: 9e2cf15ac8db29e4fb5a1e2e0da9f015977ae17485422b19e3f614b23b40fddf
font_02_sfnt_off0001310d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1310D 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333