Malicious PDF — malware analysis report

Static analysis result for SHA-256 a192abe61bb53be1…

MALICIOUS

PDF

70.1 KB Created: 2021-02-28 19:44:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: c8a621a7d9dfe2f12d4a779b559149d1 SHA-1: 5b2a809024519ceecb30ec82112c92f0a223821c SHA-256: a192abe61bb53be13d783f801a11309e9add5bd43368e1d3666314b3c5d613b5
134 Risk Score

Malware Insights

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

The PDF file contains multiple external URIs and is flagged by a machine learning classifier as malicious. The ClamAV detection name 'Pdf.Phishing.Trojan' further indicates malicious intent. The document body, though heavily obfuscated, contains text related to connecting a docking station, suggesting a lure to download a payload. The presence of embedded URLs and the overall structure point towards a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/strik?utm_term=how+to+connect+hp+ultraslim+docking+station PDF link annotation
    • http://biomaniks.website/sennheiser_rs120_wireless_headphones_manual5hr3n.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384650/normal_5feff389886ea.pdfIn PDF document text
    • https://cdn.sqhk.co/nixenexax/lmZgeib/oneplus_7_launcher_apk_for_any_android.pdfIn PDF document text
    • http://drive4mclaneaustell.com/ginatedivemiiya07.pdfIn PDF document text
    • https://cdn.sqhk.co/kizofapekeku/jbshbia/kindergarten_homeroom_teacher_job_description.pdfIn PDF document text
    • https://cdn.sqhk.co/dutedape/iFMhbql/55479027335.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465685/normal_5fde06c44bd30.pdfIn PDF document text
    • http://amorexpo.com/banidowuwenavifakq4nt.pdfIn PDF document text
    • https://cdn.sqhk.co/gepeduvo/jighsRX/app_creators_pltw.pdfIn PDF document text
    • http://tezibif.mygamesonline.org/xefisew.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vutame/wewuvegalar.pdfIn PDF document text
    • https://s3.amazonaws.com/patilawasu/channel_4_tv_guide_st_louis.pdfIn PDF document text
    • http://mebukaronov.epizy.com/59751123470.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxawetawupo/31037470164.pdfIn PDF document text
    • http://miwefonozez.epizy.com/14699894612.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_off0000d2e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E8 5604 bytes
SHA-256: cdf495dbfc90452f9e2a0988b8a8999e7726aeeb8ed842d53909d13c40e291fc
font_01_sfnt_off0000e5db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DB 10996 bytes
SHA-256: 4a714fb3588716fe95177440849f94c2a1ceeb2e73a9a9f55c551039170ea62c

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