Malicious PDF — malware analysis report

Static analysis result for SHA-256 837e0e562aea65d9…

MALICIOUS

PDF

78.8 KB Created: 2021-04-09 00:04:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b9be9c7ffcaa8fa8fcb41558e57c7acf SHA-1: 8e88267030b8dde36c2093a1a7d2fec513ba6fc5 SHA-256: 837e0e562aea65d904dc09985e520b627f27391b20340b085d16bcb7e04bce55
254 Risk Score

Malware Insights

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

This PDF file is classified as malicious due to its extensive use of link farms and redirectors. The document contains a large number of embedded URLs, many of which point to redirector infrastructure like 'https://crophysi.ru/strik?utm_term=how+does+the+phases+of+the+moon+occur', suggesting an attempt to lead users to malicious sites. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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=how+does+the+phases+of+the+moon+occur In PDF document text
    • https://narapafugoziror.weebly.com/uploads/1/3/0/7/130775848/goxuzodaveden.pdfIn PDF document text
    • http://bigtittybella.com/is_ahsoka_alive_in_the_mandalorianr61nn.pdfIn PDF document text
    • https://fefirewaw.weebly.com/uploads/1/3/0/7/130775199/4603011.pdfIn PDF document text
    • http://reassurez-moi-fr.info/zagugiruzabedqqy.pdfIn PDF document text
    • http://teksalon.xyz/51822156900rv6p5.pdfIn PDF document text
    • http://blaugrana.ru/mai_aarti_teri_gaun_full_mp3_downloads7vyj.pdfIn PDF document text
    • http://xijipeva.mypressonline.com/bible_in_greek_and_english.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://memamawu.onlinewebshop.net/bossuet_sermon_sur_la_mort.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b26fbf3-df36-4abc-8014-53921ef69e4a/10520133422.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fa6e0f3-9c1f-4ebf-b1f8-6ad2843d7a3b/92312588319.pdfIn PDF document text
    • https://s3.amazonaws.com/zabejuvijolu/7922542923.pdfIn PDF document text
    • https://s3.amazonaws.com/risalenefazozo/how_to_write_amazon_bullet_points.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ce6c7ff-f465-4fe8-851a-ab681b01fccd/zujakako.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81e59722-e92a-4db2-9899-9d3d77ec1509/how_to_calculate_calories_in_chemistry.pdfIn PDF document text
    • http://liwetagosozel.onlinewebshop.net/how_to_set_xfinity_cable_box.pdfIn PDF document text
    • https://s3.amazonaws.com/golepe/bodyguard_movie_ka_video_song.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/zurota.pdfIn PDF document text
    • https://s3.amazonaws.com/damerirazib/blue_lagoon_the_awakening_english_subtitle.pdfIn PDF document text
    • https://s3.amazonaws.com/gelawiweza/75636472712.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1a66296-1fa7-4c2c-ab95-0e7bf38faa77/how_to_remove_dryer_lint_trap.pdfIn PDF document text
    • https://s3.amazonaws.com/dezajok/zopabiz.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwotarotavuz/tolewipatudijipulat.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_off0000f4a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A2 5416 bytes
SHA-256: e0e35d69f2116e382ba4780d59cd3efb74a2fd7545f832c74a9110fc9ea2df42
font_01_sfnt_off000106f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F6 11892 bytes
SHA-256: 737d5bd6fc42b370ec6275c68ef7afceeb2fb657e37fa4d7582018f715b9126d