Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6820788142e42df…

MALICIOUS

PDF

69.3 KB Created: 2021-03-05 10:39:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 2486d49cdde35d14e7a207c1dbc86cfa SHA-1: 77ad374d652ef099c87c2e1a67032fe8916bf4c9 SHA-256: f6820788142e42df2c29e234690e66a6525f986fa4f264e95070bfad70adbb8a
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The document body, though heavily obfuscated, suggests a lure related to 'dry cleaners oxford ma', likely intended to trick users into clicking malicious links. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

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://druttle.ru/wix?keyword=dry+cleaners+oxford+ma PDF link annotation
    • http://nopotaz.medianewsonline.com/osha_aerial_lift_training_requirements_2020.pdfIn PDF document text
    • http://raguvigawak.mypressonline.com/collect_all_shells_links_awakening.pdfIn PDF document text
    • http://safijejog.mygamesonline.org/66921532009.pdfIn PDF document text
    • https://xivapumi.weebly.com/uploads/1/3/1/6/131606059/bigajawiv.pdfIn PDF document text
    • https://dowusasetitemej.weebly.com/uploads/1/3/4/3/134307927/wefiromobel_jozofetavoxut_katinijofixoluw.pdfIn PDF document text
    • https://cdn.sqhk.co/nuwuzasemifo/jXdpji4/67537751234.pdfIn PDF document text
    • http://jitokinut.iblogger.org/segikesugopiwerabokotegi.pdfIn PDF document text
    • https://cdn.sqhk.co/vagofedewat/hEjcHep/simulacra_2_cast.pdfIn PDF document text
    • https://cdn.sqhk.co/zokuwagopole/ehdhaah/78154577250.pdfIn PDF document text
    • https://jefanumu.weebly.com/uploads/1/3/4/8/134889008/tedutenap-guxezojifudep.pdfIn PDF document text
    • https://sidilatadafexu.weebly.com/uploads/1/3/1/1/131164021/tapilig-fedin.pdfIn PDF document text
    • https://cdn.sqhk.co/xolilipedeko/cUgegjW/bandpass_speaker_box.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/fujadabez/glencoe_mcgraw-_hill_oklahoma_algebra_1_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/angular_6_ng_template_outlet.pdfIn PDF document text
    • http://bituxezemas.epizy.com/coin_collecting_merit_badge_worksheet.pdfIn PDF document text
    • http://pokizepifowuw.epizy.com/tofabidadu.pdfIn PDF document text
    • http://watokugen.epizy.com/baba_yetu_piano_sheet_music_free.pdfIn PDF document text
    • http://lodiwiseta.rf.gd/svxlink_raspberry_pi_interface.pdfIn PDF document text
    • https://s3.amazonaws.com/resixexi/chegg_answers_website.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_off0000d023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD023 5336 bytes
SHA-256: cbed80c201e26dd86699bf2c42619e96d1c7b515cb65cd42582f80af1d65f335
font_01_sfnt_off0000e249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE249 10968 bytes
SHA-256: 52c729ee83e078140b8609519ef26cf314a0c19e2b119b18ae9682e48dd75a25

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