Malicious PDF — malware analysis report

Static analysis result for SHA-256 838144df91c870cf…

MALICIOUS

PDF

81.3 KB Created: 2021-03-30 23:29:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 16229fd377d8bcfd0d6e82825f98e29e SHA-1: 8b505e954ad6736236545909a1e4d965e9cc9734 SHA-256: 838144df91c870cfdf8e93e3bc301b4135cfeea2f5353ea7f904dc703548f65d
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://soxebez.ru/wix?keyword=fox+and+wolf+anime PDF link annotation
    • http://abistrans.ru/guide_le_routard_vietnamrutq2.pdfIn PDF document text
    • http://55571.ru/vobetunegaxazuwowevebezas5re3q.pdfIn PDF document text
    • http://twirlini.com/13175839636ad4vo.pdfIn PDF document text
    • http://buybritishcat.com/alexander_the_great_accomplishments_timeline6xv8y.pdfIn PDF document text
    • http://instapriz.website/futhark_a_handbook_of_rune_magicw22iv.pdfIn PDF document text
    • http://bcipreactivaperu.com/wewizefoxodb4ji2.pdfIn PDF document text
    • http://emirofficialzm.com/85121297250ezcul.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/42eb8ac8-9e5b-4781-a1eb-aeb5f658093d/8692189497.pdfIn PDF document text
    • https://s3.amazonaws.com/jepinebawo/timex_1440_sports_watch_battery.pdfIn PDF document text
    • https://s3.amazonaws.com/mogedozara/comcast_report_outage_phone_number.pdfIn PDF document text
    • https://466f9527-ada3-48b4-ac0c-4ba5546996ca.filesusr.com/ugd/a4b6b9_c8d6d17e4438408abd08e123b14f8fdd.pdf?index=trueIn PDF document text
    • https://bf68d742-fb98-404a-ab47-1dcf24f7df52.filesusr.com/ugd/83e7fd_34532a42480147ce8193e74b6ddfda57.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/serogajugomiji/poxofugesetaxovil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/786324dc-7ecd-43a1-8a85-8cdd688ba280/the_shack_book_quotes_with_page_numbers.pdfIn PDF document text
    • https://s3.amazonaws.com/selivuvumepaveb/how_to_connect_my_skullcandy_indy.pdfIn PDF document text
    • https://s3.amazonaws.com/dinigugaxej/julogawosivujiri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d75eac9-329b-463e-9fb6-4acff324a65e/swann_wifi_camera_setup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f89a0fc-323b-41f2-b01e-dee81011f0bb/zefizasufowifi.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwamoxamo/61481805578.pdfIn PDF document text
    • https://s3.amazonaws.com/pazatuv/thinking_fast_and_slow_chapter_summary.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_off0000f45f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45F 3188 bytes
SHA-256: bbc8d1a45661ac384e311ff3fd6ae84b2abbf3e395832ff429898e1149001bdf
font_01_sfnt_off0000ffc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC0 4892 bytes
SHA-256: 10161ea2ebb4a993732cfa29f241bc10b8fd6f373d50bddf0110032f1f21cf34
font_02_sfnt_off00011077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11077 11276 bytes
SHA-256: e6ecf108c7886c8739a5903316efab099a5ae48a28ecd0808db5e333809087dc

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