Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4ec5d23c79ad48a…

MALICIOUS

PDF

71.9 KB Created: 2021-02-12 22:12:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: a362dfccf8059bab409dca3d4b3dd167 SHA-1: 001b52ff22f9a3f608aa81e3a293af9301cd1eaf SHA-256: a4ec5d23c79ad48a289534772dedbe4be4865686076595212a3355d23a4f19b5
196 Risk Score

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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=wordly+wise+book+11+lesson+7+answer+key PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4475217/normal_5feead5fb16b4.pdfIn PDF document text
    • https://nemelodanunoju.weebly.com/uploads/1/3/0/8/130874480/5191172.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459166/normal_5fe70906139c7.pdfIn PDF document text
    • https://cdn.sqhk.co/jaruxabal/ehghfgf/wrestling_revolution_wwe_2k16_mod_download.pdfIn PDF document text
    • https://cdn.sqhk.co/pubamegumox/hZpggji/36008867946.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426679/normal_5fca212ca3307.pdfIn PDF document text
    • https://cdn.sqhk.co/datawafag/ekjwFW2/45805536121.pdfIn PDF document text
    • https://feposejixadolo.weebly.com/uploads/1/3/4/7/134744373/3303534.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494669/normal_5fe0e20fae92e.pdfIn PDF document text
    • https://cdn.sqhk.co/kajipazuto/haThbjj/viral_videos_on_youtube_today.pdfIn PDF document text
    • https://gabinomila.weebly.com/uploads/1/3/4/7/134763369/8182118.pdfIn PDF document text
    • https://sejixegagetuta.weebly.com/uploads/1/3/0/9/130969850/2968b8126c.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/faduxodiwo/zixezixubetalid.pdfIn PDF document text
    • https://s3.amazonaws.com/warapagefasovi/assembler_3_en_un_seul.pdfIn PDF document text
    • https://s3.amazonaws.com/kugelilizibuwum/chori_chori_1956_film_song.pdfIn PDF document text
    • https://s3.amazonaws.com/lazolu/sound_of_silence_sheet_music_saxophone.pdfIn PDF document text
    • https://s3.amazonaws.com/benuka/nuclear_waste_management.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_off0000da39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA39 5360 bytes
SHA-256: 9668c944c85401d7300d5104d17bba3f7abe7ddb15b071d7bdab60971c643634
font_01_sfnt_off0000eca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA7 10980 bytes
SHA-256: c5e8bce341fc78c71c675330ef91264c8b3a7cfc8798cd37606f7d3355659045