Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c445d4042f115af…

MALICIOUS

PDF

88.8 KB Created: 2021-04-17 03:02:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c538946b454f6c2a2417ffdf957d7486 SHA-1: 1bfdc304ba69403f6b803e91604034306b62051f SHA-256: 4c445d4042f115aff8c0a59e2788ba23690b17059b18ee87b3a5e9f4d83ec54b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://fokemale.ru/strik?utm_term=is+autophagy+the+secret+to+life+extension PDF link annotation
    • https://cdn.sqhk.co/raxulaxesob/WGifWhd/piano_play_and_learn_music_mod_apk.pdfIn PDF document text
    • http://vuwimoxit.mygamesonline.org/sowizovemivigob.pdfIn PDF document text
    • http://keto-s1.com/wowibizutixuvetipawasuwebtv00.pdfIn PDF document text
    • http://fullstacket.online/are_nascar_collectibles_worth_anythingwwotn.pdfIn PDF document text
    • https://cdn.sqhk.co/tejikeluz/g9jgias/idle_galaxy_apk.pdfIn PDF document text
    • http://idealica-official.website/saparidomujilazurplutc.pdfIn PDF document text
    • https://cdn.sqhk.co/kiraxozi/1phghgc/joker_movie_2019_ost_soundtrack_download.pdfIn PDF document text
    • http://rimka.xyz/barnett_cross_3x32_crossbow_scopemeq5t.pdfIn PDF document text
    • https://cdn.sqhk.co/neseleko/8Xjcjbi/tigoxotaw.pdfIn PDF document text
    • http://vurejowug.mypressonline.com/selling_price_and_cost_price.pdfIn PDF document text
    • http://verification-help.com/troy_bilt_8000_watt_generator_13500_starting_watts_pricezjddp.pdfIn PDF document text
    • https://cdn.sqhk.co/gidenateg/XjiOyjd/wordbrain_2_research_level_3.pdfIn PDF document text
    • http://gk-kuban.ru/5302973205csb5m.pdfIn PDF document text
    • http://axacheat4.xyz/animal_farm_movie_1954_trailerc17ma.pdfIn PDF document text
    • http://zukoxofiro.22web.org/kixakanamawuxeni.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wipapirub.epizy.com/rajukene.pdfIn PDF document text
    • http://fufuzadawefor.onlinewebshop.net/pebajoj.pdfIn PDF document text
    • http://rowinipi.epizy.com/los_patitos_feos_boris_cyrulnik_descargar.pdfIn PDF document text
    • https://a4346b84-4611-49ab-b113-80c9188ca613.filesusr.com/ugd/078c79_00346978fc7c4daa973fbfa6d3fb4191.pdf?index=trueIn PDF document text
    • http://mexesumofiruvaf.rf.gd/nixijurizabekaxefakala.pdfIn PDF document text
    • https://4121a797-204a-431c-92a8-8e24072fb342.filesusr.com/ugd/b972d5_0d784303ee2743648360475107cef5c5.pdf?index=trueIn PDF document text
    • http://vidugozu.atwebpages.com/45825487597.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_off00011cef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CEF 5384 bytes
SHA-256: 0773d9432cef20e8a666d26d3eefe46502f53fb8f6ff7c330fc98d6651d0ea04
font_01_sfnt_off00012f4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F4F 11036 bytes
SHA-256: a69baaf1f898550f74506c9529fdf9e2ebdb4788e4c321905f96e68767e264af

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