Malicious PDF — malware analysis report

Static analysis result for SHA-256 d942d2ee4db2e13b…

MALICIOUS

PDF

83.3 KB Created: 2021-03-08 14:45:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 611f484091fb18dba6e05d8c7f77f284 SHA-1: b2237fd9ef277eda0a468f1901a6d6cf2c76175d SHA-256: d942d2ee4db2e13b52c8e81159224921ea4d1f1a15580ac22fc29279187f37a0
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/wix?keyword=antivirus+for+android+apkpure PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4455405/normal_60216458be1d0.pdfIn PDF document text
    • http://sixesijilolun.mywebcommunity.org/place_value_disks_subtraction.pdfIn PDF document text
    • http://lenudes.com/liwowiwamazue6eba.pdfIn PDF document text
    • http://hihikane.space/jowixigisanutogotapuwts4gg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455374/normal_5ff005cb76b5e.pdfIn PDF document text
    • http://disozire.mygamesonline.org/fijovegenu.pdfIn PDF document text
    • http://artdebug.site/formalit_bnficiaire_effectif_tarifs0y2n.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500417/normal_602df383e83c7.pdfIn PDF document text
    • http://mugedly.xyz/catchmaster_insect_trap_and_monitor_288ifas4r.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383912/normal_602a5b0f85885.pdfIn PDF document text
    • http://msertis.xyz/jadufigizu773g2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae140655-321a-4ceb-8161-da3f14d36040/edge_of_the_empire_dice_roller.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af623d2c-6cf4-4017-a26e-cbd5f807a890/warejevi.pdfIn PDF document text
    • http://buguwotibiven.rf.gd/stihl_chainsaw_ms180_spark_plug_gap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77560eab-22ff-402c-a778-7ffb6b66d78d/what_is_the_correct_order_to_watch_all_marvel_films.pdfIn PDF document text
    • http://xipanizi.myartsonline.com/how_to_watch_two_twitch_streams_at_once.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67267f3a-62fe-41b3-9f2d-2dec242d23a9/xovimowotitabexega.pdfIn PDF document text
    • http://poxemibusap.epizy.com/adjetivos_demostrativos_ejercicios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83f56836-b729-4fa5-80c1-f4ca70342658/how_to_make_6_figures_in_2_years.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_off000109af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AF 5116 bytes
SHA-256: 518bd4f71d83cf02170e8eb2c7c4ca367308e131fa200e47029fa207a24e8893
font_01_sfnt_off00011b30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B30 10868 bytes
SHA-256: 8dad935276a8934b83e6dab0181482eec1867bbb899ffeb4a970a616e0b6533d

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