Malicious PDF — malware analysis report

Static analysis result for SHA-256 51cd9e69e25dd6f1…

MALICIOUS

PDF

105.9 KB Created: 2021-03-23 03:38:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: ac66499e4c43ae1dec558e4a0585644b SHA-1: 5b81811c6198ed0ef01e82179d816df8c1f40d4e SHA-256: 51cd9e69e25dd6f1f7e6fcd2533e6249a545a5eb45130a72cdb5cfa27bb6adb1
86 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 an ML classifier. It uses a callback-phone (TOAD) lure. 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 0.9997

Heuristics 5

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://fokemale.ru/wix?keyword=dish+dvr+manual PDF link annotation
    • https://cdn.sqhk.co/ledodatefu/7V3VgsR/xixit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459788/normal_603e6cd085f3c.pdfIn PDF document text
    • https://cdn.sqhk.co/xagaxubibiz/bihhgib/zifonatiwotamowaril.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388619/normal_5ff8af876e824.pdfIn PDF document text
    • http://birobupalojasux.iblogger.org/backwards_and_forwards_david_ball.pdfIn PDF document text
    • http://bofitakun.iblogger.org/71012881056.pdfIn PDF document text
    • https://labaveboto.weebly.com/uploads/1/3/4/6/134611097/3e2a985a09c.pdfIn PDF document text
    • http://faguduni.22web.org/pobisidewizenowizeveb.pdfIn PDF document text
    • https://cdn.sqhk.co/mojesoje/aidhfhg/buvonovugipibatumuvujez.pdfIn PDF document text
    • https://kavisovilige.weebly.com/uploads/1/3/5/3/135308643/fodawosamiwopi-foliduzid-nijumajelukiw.pdfIn PDF document text
    • http://xezobofelupazat.22web.org/povinobunojedavidoteloxug.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384160/normal_5ff3f64540999.pdfIn PDF document text
    • https://cdn.sqhk.co/munemuzabuk/agf4Rgc/ala_hazrat_naat.pdfIn PDF document text
    • https://gajulusube.weebly.com/uploads/1/3/4/8/134896651/5774334.pdfIn PDF document text
    • https://dapobirot.weebly.com/uploads/1/3/4/8/134888013/183011.pdfIn PDF document text
    • https://vedefagam.weebly.com/uploads/1/3/0/8/130814874/tavajolelizotud.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://koxusaje.epizy.com/potatidado.pdfIn PDF document text
    • http://zabesawafusoxa.rf.gd/believe_in_yourself_joseph_murphy_free_download.pdfIn PDF document text
    • http://vobujubiga.epizy.com/secret_language_of_birthdays_december_23.pdfIn PDF document text
    • http://zuzaxitiruxojax.epizy.com/buildcraft_guide.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000150df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150DF 4700 bytes
SHA-256: 092cd0c4d29af51f318f305a5136f0d468894886b2f67d56041bedf467b4b819
font_01_sfnt_off00016092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16092 13056 bytes
SHA-256: 71a827512e6cf5114719f0c3f36cecaba91776f35e3c77d064cc3b531d5a5a92
font_02_sfnt_off00018b20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B20 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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