Malicious PDF — malware analysis report

Static analysis result for SHA-256 612d6011e451650d…

MALICIOUS

PDF

71.9 KB Created: 2021-03-05 13:25:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: 24b870100a3dca2a433998309591f419 SHA-1: 7bc2410a4ba405ea74292920223517668fa8c0a4 SHA-256: 612d6011e451650d9bf413b9cb3c77a5af70d717c117caff566d4558e46df27e
254 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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=coleman+electric+furnace+parts In PDF document text
    • https://cdn.sqhk.co/bemememu/gjzE3pa/91461786096.pdfIn PDF document text
    • https://cdn.sqhk.co/toxinize/dJqgfoe/crosswords_with_friends_answers_11_20_19.pdfIn PDF document text
    • https://cdn.sqhk.co/notizejamebo/hc7ieig/74780081475.pdfIn PDF document text
    • https://cdn.sqhk.co/zidexamuwela/mDhgjhA/93027202027.pdfIn PDF document text
    • https://cdn.sqhk.co/vemudumuxixu/6jigdje/kosovok.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/kudowo/58612578991.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21c286ac-9a1a-4432-bbd1-4c92a96c2164/what_does_shipment_delayed_mean.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwuxot/30739485818.pdfIn PDF document text
    • https://770ad53b-b55e-4e58-b1eb-3709f41304f7.filesusr.com/ugd/98e298_178484b97be643839a6ef844f0ac33b6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab971cf3-4801-499e-ab26-86306dd1b1fe/how_much_does_a_promethean_activboard_cost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7aab20e3-a944-4c74-bb65-21cb234f39e2/how_many_calories_is_in_one_krispy_kreme_doughnut.pdfIn PDF document text
    • https://39ad70c8-6a03-4de2-a89b-b0209cba5754.filesusr.com/ugd/d2759c_0ec38ca9dcc94beeac6a6d0fbea3c7f5.pdf?index=trueIn PDF document text
    • https://a9864912-ad24-422b-99f3-2d90f7703507.filesusr.com/ugd/d6af85_24dce255380543b197e63373f64864c9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/160c72cb-4f73-4f7a-a8ff-29fc280d02bf/zidajufepemovalibaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/224f5bcc-5139-43da-944d-61128a7fa4b6/how_to_make_distilled_water_video.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29b8e4d9-e84a-4bfb-9499-059b448850b2/good_credit_score_experian_uk.pdfIn PDF document text
    • https://2489a575-72f7-492f-b117-28cfe4a4d2a3.filesusr.com/ugd/d81705_a2dcb7d943464c67a4c1bbafd0a25472.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kovezodepugov/vixipefafimifat.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_off0000deb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB0 5064 bytes
SHA-256: 1e5805d4c2910249c90d83dd8dc753b60815c78fee2d26c97aab17364485f6cc
font_01_sfnt_off0000efca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCA 10252 bytes
SHA-256: 4015bb59806ab8b4eaa74f6381ba288696388982869595e95d6023e61fec37fc

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