Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc6f0c15504b583a…

MALICIOUS

PDF

345.5 KB Created: 2021-03-28 05:48:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 873f22605f3bf1382cb4fad6bd81d363 SHA-1: 6e85fa72c166a8bda02f4972faa2cb9d1961e14e SHA-256: dc6f0c15504b583a4e4155c5035d0ca7ff7484b71c4e1331d5c688bdb71fbed1
194 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'crophysi.ru'. This URL is presented as a free download lure, likely to trick users into clicking and being redirected to malicious content. The ML classifier also flagged this PDF with a high probability of being malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8201

Heuristics 5

  • 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.
  • 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/123?utm_term=biped+animation+3ds+max+free In PDF document text
    • http://tifusavegapawuf.mygamesonline.org/how_do_i_select_the_spin_only_on_my_bosch_washing_machine.pdfIn PDF document text
    • https://cdn.sqhk.co/fasisela/arhqhjy/82597231957.pdfIn PDF document text
    • https://cdn.sqhk.co/noneniwetav/eh2gepO/outliner_2_clippers.pdfIn PDF document text
    • http://pefujogori.iblogger.org/sokawofaxetemozomu.pdfIn PDF document text
    • http://xosudodobuj.iblogger.org/38185293820.pdfIn PDF document text
    • http://kubisobej.22web.org/bemugolijo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367300/normal_602d4b05c92b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450154/normal_60220a6bb14fe.pdfIn PDF document text
    • https://cdn.sqhk.co/gutinisiv/gfsijxk/89516941756.pdfIn PDF document text
    • http://zitokujamu.mypressonline.com/angina_de_pecho.pdfIn PDF document text
    • https://cdn.sqhk.co/jowowibow/jiheheg/mubuli.pdfIn PDF document text
    • http://gudelew.mywebcommunity.org/91084411726.pdfIn PDF document text
    • https://cdn.sqhk.co/munakuvu/iizVVhj/sikebuwudevetoluvi.pdfIn PDF document text
    • http://korogesubelokut.mypressonline.com/75704600865.pdfIn PDF document text
    • http://feruwikabi.iblogger.org/himedia_h1__android_tv_box.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://s3.amazonaws.com/gozilum/best_free_excel_budget_spreadsheet_template.pdfIn PDF document text
    • http://wezovekoxawotez.rf.gd/ukulele_chord_melody_book.pdfIn PDF document text
    • http://bivojeda.atwebpages.com/how_to_start_a_comic_script.pdfIn PDF document text
    • https://s3.amazonaws.com/buwosevax/arduino_sketch_examples.pdfIn PDF document text
    • http://zuzidem.epizy.com/la_voluntad_azorin.pdfIn PDF document text
    • https://s3.amazonaws.com/pozokimepe/redijoxavupiwa.pdfIn PDF document text
    • https://s3.amazonaws.com/siwixomudit/tarodapaguzozitewamegalis.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0004de87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4DE87 8192 bytes
SHA-256: c44e12e152ed3d9a5e484aa4d8dc1aec6b841848027728658e9cd5e14ae84c53
font_01_sfnt_off0004fa16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4FA16 5436 bytes
SHA-256: 81b639b0c69bf1e35fa166e9546ed57a8dee5c9097f271f14a2a5ea597e8bed6
font_02_sfnt_off00050c82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x50C82 7660 bytes
SHA-256: 97c601e17790400e6ab4ce4ba92744a2ce30b6e3bd5631fddff02ca98ca0f2f2
font_03_sfnt_off000521bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x521BD 16936 bytes
SHA-256: 3e1c22c183fbed89e016a21c9c6859062154749efde6ff31489c3140064b8bc4