Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0adb622a93c049f…

MALICIOUS

PDF

79.3 KB Created: 2021-03-14 04:49:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 947b2d3211b2fc58677860ec486da79b SHA-1: 04e151448712a8393c95f31393944c82ffbc9dbc SHA-256: a0adb622a93c049f828e970785632cfd661da118451e6ab4eb1ac876f5b58ca0
126 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm or phishing lure. The PDF's structure and embedded content indicate it's designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://nipisod.ru/wix?keyword=angle+of+depression+word+problems+kuta+software+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4451752/normal_5ff1bd72ac05e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403804/normal_5fe80372d9714.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410447/normal_6017deaec01a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380230/normal_603c17f21fdbc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454055/normal_6035d9637b84d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424997/normal_5feb2f90bcc43.pdfIn PDF document text
    • http://nakijeku.mygamesonline.org/andalucia_map.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385230/normal_5ff0c7f25b7ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480889/normal_60100e939f923.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369316/normal_6013f3319925a.pdfIn PDF document text
    • http://tepugorotewole.medianewsonline.com/82752057133.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fazomexaboru.rf.gd/is_it_illegal_to_kill_an_elephant_in_africa.pdfIn PDF document text
    • http://xosofidevutora.epizy.com/pebavazi.pdfIn PDF document text
    • http://penobugixova.atwebpages.com/athlean_xero_download.pdfIn PDF document text
    • http://wokixewo.epizy.com/54257121041.pdfIn PDF document text
    • https://s3.amazonaws.com/jakujakula/42538040296.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawexawinogad/vilobiwolejoputiruko.pdfIn PDF document text
    • http://widagutevutedik.epizy.com/math_test_answers_app.pdfIn PDF document text
    • https://s3.amazonaws.com/fewunadupop/after_twenty_years_by_o_henry.pdfIn PDF document text
    • https://s3.amazonaws.com/lazolu/8885297084.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_off0000f465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF465 5648 bytes
SHA-256: 800e25e2bcbd2182e8073ffdf9799dcb8f2bea431a98b85609bb2af1a34270cf
font_01_sfnt_off00010796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10796 11100 bytes
SHA-256: 7d11a06269acbbdc1da2d2817c64fa93d5706620cc8739436d90f27218351c64

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