Malicious PDF — malware analysis report

Static analysis result for SHA-256 c51c7638d98f682e…

MALICIOUS

PDF

83.4 KB Created: 2021-03-05 03:54:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 368312ed324cee0948d1ad9499f66be1 SHA-1: 25de7f1278d0b41ca2004f712db1216f57f0d4a3 SHA-256: c51c7638d98f682e696a2a21275f9fe9670106c7fc4f5523dd0138f13e65c1b4
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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/award?keyword=kindergarten+worksheets+book+pdf+free+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4366654/normal_6007e733415bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490949/normal_5fda07b29383e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404107/normal_600646bd1c92d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369633/normal_5fe2c49ee33e9.pdfIn PDF document text
    • http://frontend-developer-azaynullin.site/28503009408vc683.pdfIn PDF document text
    • http://onlinetiser.website/how_to_read_guitar_chord_sheet_music7axtf.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/pasawexawinogad/57475094866.pdfIn PDF document text
    • https://55d63786-14d6-44de-84d0-33f1fb383c44.filesusr.com/ugd/45fd81_c6324766de0e46b8894e45d24faa6845.pdf?index=trueIn PDF document text
    • https://e0fa0743-814d-41de-b6a5-47f787911882.filesusr.com/ugd/89d2ef_aeadd228999f4d43933401807eae64e9.pdf?index=trueIn PDF document text
    • https://13adc596-845f-4f4a-b539-e2c04a0a4b5a.filesusr.com/ugd/6e2da7_5a17c82dd8134613aceb48c58d870e55.pdf?index=trueIn PDF document text
    • https://5405d108-7f1e-482b-a10c-e06f62b7505d.filesusr.com/ugd/d941b1_6fe12a9e8d684dc98b51248b9687c811.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/savukojubusum/terumizexitepobu.pdfIn PDF document text
    • https://s3.amazonaws.com/sizabo/brainiac_maniac_piano_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/posufij/local_guide_level_8_benefits.pdfIn PDF document text
    • https://e6f9d1db-9bad-45ba-a188-0e8e378e8087.filesusr.com/ugd/99b222_112713db7d5a4893b00bd34f2dba419c.pdf?index=trueIn PDF document text
    • https://d8acad56-eb9a-42d1-a06c-a695c5b02328.filesusr.com/ugd/0ad6c7_02be6d8b38d14504bab753b75e3abdf6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tolivajupeku/8219774683.pdfIn PDF document text
    • https://71da2aa5-51c3-4f2c-ab18-08bbbad20131.filesusr.com/ugd/d216cb_16d256514bbf46d9b8ae4fc08e08349d.pdf?index=trueIn 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_off000109a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A8 5568 bytes
SHA-256: 0a25d769237434ab87878cb41a58ffe0e8fb104009aef1228f0d5118939b61e1
font_01_sfnt_off00011ca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA4 10404 bytes
SHA-256: 03d2f2a2671f324e3e0520863d52bc7cc285a81d00923b9501f7420ec3f7249f

Open this report in the interactive analyzer, or submit your own file for analysis.