Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8d7035bd1de2a4f…

MALICIOUS

PDF

79.0 KB Created: 2021-04-10 11:05:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 581aaf5832b0ee689148ffba6ce154ae SHA-1: 53eaad2f0576afe80a9a4affb08f29306f16d300 SHA-256: a8d7035bd1de2a4ff7616666ccba50c845d90d1598517f61816fa678c585f769
146 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, many hosted on disposable domains, and is described as a link farm. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate an attempt to redirect users to potentially malicious sites, likely for phishing or malware distribution.

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://zajinet.ru/strik?utm_term=nordictrack+t5.7+treadmill+parts PDF link annotation
    • https://dotaterezisal.weebly.com/uploads/1/3/4/7/134771172/gomorudadegar.pdfIn PDF document text
    • http://retapadu.medianewsonline.com/budunodawubuzusedajadifo.pdfIn PDF document text
    • http://finutepanaj.iblogger.org/9670325857.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500889/normal_5fc8975e56864.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386828/normal_606010c937c99.pdfIn PDF document text
    • https://rirofogarerena.weebly.com/uploads/1/3/0/7/130775169/a33657.pdfIn PDF document text
    • http://fejiximodanu.mygamesonline.org/bbc_compacta_class_11_english_answers.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458829/normal_5fec0866debc2.pdfIn PDF document text
    • http://bafiselavanebep.mywebcommunity.org/how_do_i_reset_my_taylor_digital_thermometer.pdfIn PDF document text
    • http://garowige.iblogger.org/android_tv_rom_for_pc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445881/normal_5fcb566d01385.pdfIn PDF document text
    • http://jarewitof.mypressonline.com/rorigavasijej.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
    • https://s3.amazonaws.com/fukepez/bernette_sew_go_5_manual.pdfIn PDF document text
    • http://wewamamewiler.atwebpages.com/lisogodop.pdfIn PDF document text
    • http://wujagenak.atwebpages.com/62208837393.pdfIn PDF document text
    • http://bikumekomem.epizy.com/bupajo.pdfIn PDF document text
    • http://visevagopar.onlinewebshop.net/pronunciation_dictionary_oxford.pdfIn PDF document text
    • http://nizipere.epizy.com/43729821114.pdfIn PDF document text
    • https://s3.amazonaws.com/zewimu/kenmore_coldspot_not_getting_cold_enough.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_off0000e4d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D3 5168 bytes
SHA-256: 085879307db44823b04fa05192e6426e92c9c45c9bcad3dbfe38a2e3696471cd
font_01_sfnt_off0000f685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF685 11948 bytes
SHA-256: 7f7129f4f849a5fb9e187a53efc3ce07dc0ff1ae4297a11f83e71b1574346e3c
font_02_sfnt_off00011f1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F1E 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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