Malicious PDF — malware analysis report

Static analysis result for SHA-256 03e64760e270f802…

MALICIOUS

PDF

79.9 KB Created: 2021-02-07 08:49:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 182d29c2d0618505890437ec5bfd9cc5 SHA-1: 6fb202ee57f7c5bd890aa196c4859c35937919ce SHA-256: 03e64760e270f802b1f6e018550c0d4ce3dbf72e7fbc545fdf942401d328b7ef
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable domains and potentially malicious content, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The ML classifier and ClamAV also flagged this PDF as malicious, suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the structure and heuristics strongly suggest the PDF is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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.
  • 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://crophysi.ru/123?utm_term=apple+mortgage+cake+website PDF link annotation
    • http://passive-income.ru/38663922484cjg8x.pdfIn PDF document text
    • https://favotofuti.weebly.com/uploads/1/3/1/8/131871633/zasuk_maketevitodoguw_borufotoleg.pdfIn PDF document text
    • http://dawuxapi.iblogger.org/21551720072.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406455/normal_5fe9ad35b58d7.pdfIn PDF document text
    • http://austritkfa.com/windows_10_pro_activator_kickasshgul6.pdfIn PDF document text
    • https://wubedalenab.weebly.com/uploads/1/3/1/3/131383767/1818434.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408707/normal_600d6835c28ee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412378/normal_6005fc6c47367.pdfIn PDF document text
    • http://center-san.ru/18331268720chth8.pdfIn PDF document text
    • https://binikefesomeb.weebly.com/uploads/1/3/5/3/135386190/af085ee45b02f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372361/normal_60133fa687cca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405895/normal_5fe7ec8700670.pdfIn PDF document text
    • https://xinuxarovota.weebly.com/uploads/1/3/0/7/130776268/5660626.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419849/normal_601eff4161ad2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490752/normal_5fd9886d488b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411512/normal_5fda4f4861ce8.pdfIn PDF document text
    • https://wugovaxovagebi.weebly.com/uploads/1/3/0/9/130969592/sajakugukaleku.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427097/normal_5fc68352ba8e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390371/normal_5fd3b19e2f932.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414873/normal_5fecf38444cac.pdfIn PDF document text
    • http://dkblogin-de.com/pudufiwisajejosiwbs41.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
    • http://kidagemomosate.epizy.com/cbt_challenging_thoughts_worksheet.pdfIn PDF document text
    • http://togujekunigek.rf.gd/game_launcher_apkpure.pdfIn PDF document text
    • http://zigonetisakep.epizy.com/fatisejupuzudoto.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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC9 5220 bytes
SHA-256: 5c75907446aaf02ca4ed93c85bc40a5005a167fbac866518c212ad6fb46585c2
font_01_sfnt_off0000ec9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9A 2172 bytes
SHA-256: 13db11b46c1e9bff7400d79357c3ea798b3528b21df11cf9b8fe6459124f0feb
font_02_sfnt_off0000f5fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FA 14640 bytes
SHA-256: d2afacf5e002c4f5dd0a6adc680950076a02dc5c6e52699d096d96aea4175ef6
font_03_sfnt_off00012396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12396 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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