Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb5d9d1bc7a1c188…

MALICIOUS

PDF

76.7 KB Created: 2021-04-05 11:12:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: fcb82d61a21e4a669f0a1289893a83e1 SHA-1: c261a1584d1ba35370243c3a86aae369d1c71dc0 SHA-256: cb5d9d1bc7a1c1887b15cfc615b2435b96c8ce32bf419b4ce758436c7161af64
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to SEO-optimized content farms, suggesting a phishing or malware distribution scheme. The primary URL, 'https://jottigo.ru/wix?keyword=calculate+with+confidence+6th+edition+pdf+free', is identified as a redirector for a 'free-download phishing' lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly indicate malicious intent, likely related to spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jottigo.ru/wix?keyword=calculate+with+confidence+6th+edition+pdf+free PDF link annotation
    • http://consequences.space/xafasuwijubovifempoo.pdfIn PDF document text
    • http://zdorovienashevse.xyz/catholic_wedding_ceremony_booklet_template_free84up8.pdfIn PDF document text
    • http://nosinoski.shop/panasonic_bq-cc17_green_lightj9346.pdfIn PDF document text
    • http://oneitshop.info/nifojuleporegozajiloxx9h77.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://a2c67b61-a01d-4053-b7ad-f1487bca8054.filesusr.com/ugd/24853a_78cbd4a769e84b8493f50ad6d081e7b1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fajixe/where_is_the_learn_button_on_the_liftmaster_garage_door_opener.pdfIn PDF document text
    • http://fefaborap.rf.gd/teburibuduwelu.pdfIn PDF document text
    • https://s3.amazonaws.com/tugumeb/africa_twin_2018_manual.pdfIn PDF document text
    • https://0503187d-52cd-4237-9521-a3cb9bf551ae.filesusr.com/ugd/5bb01c_37a1c977087643e6a9cdadb614d86cab.pdf?index=trueIn PDF document text
    • https://b3e719cc-30df-460f-a5cd-d2fa480fcfac.filesusr.com/ugd/b2b6a5_2803b972bc6246318eebfaf72d8df970.pdf?index=trueIn PDF document text
    • https://4abf464d-34d5-4c80-8de5-e64f30e04530.filesusr.com/ugd/8b3eb5_ccf77167230440dfbd9a6f026acf0784.pdf?index=trueIn PDF document text
    • https://5e446c31-fcb6-4427-a178-91ee45bbff8b.filesusr.com/ugd/4e76b8_d5435fc105f24f7c88017b4a5a1994d1.pdf?index=trueIn PDF document text
    • https://b7e73dfe-ad35-4791-b4f7-7500f5b7882c.filesusr.com/ugd/bc79a4_2b5c7f4438174e59a990dbe58197601f.pdf?index=trueIn PDF document text
    • https://7a69a04d-b0b3-478e-a927-895b34d3dd44.filesusr.com/ugd/159848_aa01a2bb5ae740a6937cdeada4df0443.pdf?index=trueIn PDF document text
    • https://1c019786-7048-4615-837a-ae53f087c4ae.filesusr.com/ugd/8b4172_de09cbd1fe724c05ba81cad391cf52a7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xewamejixolefaj/ffiec_call_report_instructions_rc-_m.pdfIn PDF document text
    • http://zasaraba.epizy.com/lewubojutafiwetejam.pdfIn PDF document text
    • https://9e269ae7-c3cf-4b9f-bde2-1d9be064b7bf.filesusr.com/ugd/139869_af331edb73b34e03a3241ac4f6f1b1a3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zagapaxa/aeriforme_etimologia_griega.pdfIn PDF document text
    • https://8fc1c2d6-49ba-4d63-8b95-0327ef2b1627.filesusr.com/ugd/1849a1_e8786476005a4fcbbae9b60a4f6b871d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mosezavor/43598339550.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FB 5216 bytes
SHA-256: 38eb73ee1ab66b0fcb6b2e5082afe2c803dbb7b48f49b23ba6bed5fdc17f5eb4
font_01_sfnt_off0000f3bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BD 10468 bytes
SHA-256: f39bb4e73e1aad0a337d8ba6845e03c6aa37665bfa2190c326e6a50a61e9ca55
font_02_sfnt_off0001174a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1174A 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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