Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f3dba1ba506a77f…

MALICIOUS

PDF

66.9 KB Created: 2021-03-02 20:53:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 95d624927cde13c8d7be703b39de4b19 SHA-1: c3a45ef2e3730f100bf7d266499d1f1404b36ac7 SHA-256: 7f3dba1ba506a77f6730e5b4570c5a451fc6ef2bef072beac44def95b3f6880c
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to obscure malicious links. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it's designed to redirect users to malicious sites for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=digitech+rp55v-00+manual PDF link annotation
    • http://siondez.ru/the_godfather_2_screenplay_download6w1jh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378404/normal_6033619a6d7ca.pdfIn PDF document text
    • http://lixodamevurobar.mygamesonline.org/roku_streaming_stick_plus_remote_wont_pair.pdfIn PDF document text
    • http://kdghy.online/23213851035ipnss.pdfIn PDF document text
    • http://inmyshtangen.xyz/merejenexirudilonuduxtbw9x.pdfIn PDF document text
    • http://pushbiz.fun/18832822839s2ueq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4527859/normal_600087175a4b3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383807/normal_5ff763b729e79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463807/normal_603a2335639a0.pdfIn PDF document text
    • https://nikatomorufaxeg.weebly.com/uploads/1/3/1/4/131437252/vefipisebabej-fugipo-lakaxuxoku-wifoparajewuzi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nubimopupugu.rf.gd/pasunuwukutupomesek.pdfIn PDF document text
    • http://tenurusimuxu.epizy.com/81915994728.pdfIn PDF document text
    • http://wofaketizezoja.epizy.com/zuzasiw.pdfIn PDF document text
    • http://wafibajew.epizy.com/carrier_cassette_air_conditioner_manual.pdfIn PDF document text
    • http://kivozusemu.atwebpages.com/57108035919.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_off0000c888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC888 5528 bytes
SHA-256: 0b332d8b449321f4bad318fac0cfcf823d5e533b3fc5052f4ad9584170a19da9
font_01_sfnt_off0000db4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4A 10476 bytes
SHA-256: 34429eb712baa99b52ed27ede6a5774182350c7342262ec7148d2439993ca409

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