Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa162150fb556e97…

MALICIOUS

PDF

74.1 KB Created: 2021-04-04 22:59:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ad0bfa006b0cb0321acbfb43bdc627e5 SHA-1: b2f4fbdcd729e4f17fe6d9e65f32d47764ca932f SHA-256: aa162150fb556e97529a34c5455945f75ca73e10d8bf364a2dc0067c0fd917a0
126 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 by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable hosting domains, suggesting a link farm or phishing lure. The document body, though partially obfuscated, appears to be a lure related to applying window decals, which is likely a pretext to drive users to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://pelibifir.ru/strik?utm_term=how+to+properly+apply+a+window+decal PDF link annotation
    • http://fb-pageunderreview.com/dc_shunt_motor_working_principle2j0gg.pdfIn PDF document text
    • http://pirunumilusarib.sportsontheweb.net/davirufiru.pdfIn PDF document text
    • http://lixodamevurobar.mygamesonline.org/78055640104.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427528/normal_6009fe012c39f.pdfIn PDF document text
    • http://numberoone.xyz/41828305375s0aq3.pdfIn PDF document text
    • http://ferafukapawap.scienceontheweb.net/bioetica_concepto.pdfIn PDF document text
    • http://options.expert/gdp_per_capita_vs_median_incomexru1s.pdfIn PDF document text
    • https://vawudida.weebly.com/uploads/1/3/4/8/134890241/sagadafa_jozemukifuduleg.pdfIn PDF document text
    • https://vasirorikipik.weebly.com/uploads/1/3/0/7/130776585/b3354bebe90544.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451744/normal_606856fd03da2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365545/normal_6040f21e54d57.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498893/normal_5fcd582ecb03f.pdfIn PDF document text
    • http://gk-kuban.ru/5302973205csb5m.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443802/normal_5fcdd63dbb3a4.pdfIn PDF document text
    • http://tazaripisunoti.iblogger.org/gibutip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421354/normal_6041f52a35299.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476946/normal_6050e7d425c64.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mivazofirogo.epizy.com/simplification_questions_for_ibps_clerk_2020.pdfIn PDF document text
    • http://tekunobujolid.epizy.com/5_basic_human_needs_maslow.pdfIn PDF document text
    • http://wufagezigedo.onlinewebshop.net/91404696346.pdfIn PDF document text
    • http://kapixij.epizy.com/58262802892.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e459.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE459 5044 bytes
SHA-256: 3a7b388e1caebdecfd55306960fd751db68f00e578a2bdd060eb950e414fd484
font_01_sfnt_off0000f5a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A5 11016 bytes
SHA-256: 53ea7042aaefe05f7f6a3901858ad6901561d26b38fefcbdd86a2690bd9b655a

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