Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d594bbce7e3bfb9…

MALICIOUS

PDF

77.7 KB Created: 2021-04-16 19:45:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f808fec2bc3113af8461f75c4eae2806 SHA-1: 66866217a1fe47fdb9269546725f49e006dc50a0 SHA-256: 3d594bbce7e3bfb9bfd3f5be89fe56102780a7bb77030f5a77b5f01b6689afcb
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for PDF_SEO_LINK_FARM, indicating it's part of a link farm designed to drive traffic to external sites. The embedded URL `https://resalured.ru/strik?utm_term=celebrate+recovery+lesson+11+answers` suggests a lure related to search results. ClamAV detection as `Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0` further confirms its malicious nature, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/strik?utm_term=celebrate+recovery+lesson+11+answers
    • https://cdn-cms.f-static.net/uploads/4376098/normal_5fd8edc6c4bef.pdf
    • https://lukibufipijuzom.weebly.com/uploads/1/3/3/9/133997252/7118662.pdf
    • https://cdn-cms.f-static.net/uploads/4451949/normal_602fd21fc145b.pdf
    • https://pawonojureva.weebly.com/uploads/1/3/4/5/134522231/tibiweloxixodozes.pdf
    • https://dilomosef.weebly.com/uploads/1/3/4/3/134316650/dexamekeruzalen.pdf
    • https://wegotogad.weebly.com/uploads/1/3/4/3/134342574/balagikazav.pdf
    • https://wovupidej.weebly.com/uploads/1/3/4/6/134687137/limaximavil.pdf
    • https://tamukatiraf.weebly.com/uploads/1/3/4/7/134766395/zofodewif_bepubelos_filemeg.pdf
    • http://turoliwejaxafux.22web.org/niwenobobivajexovu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/92207829-305c-487e-87b4-ebe94e968487/1984_questions_chapter_5.pdf
    • https://uploads.strikinglycdn.com/files/9e34dc4b-6fbe-4d2f-8d4f-235974435a02/politics_among_nations_full_book.pdf
    • https://uploads.strikinglycdn.com/files/be0ba2e5-5302-415e-90f3-0b5744d4a6bb/peg_perego_john_deere_tractor_reverse_not_working.pdf
    • https://uploads.strikinglycdn.com/files/4c67530e-f08a-4b64-9c85-ab565efdddbd/dell_precision_m6800_battery_life.pdf
    • https://uploads.strikinglycdn.com/files/981f0ea7-a65d-4d7f-b6c0-a945fa3a684a/will_there_be_a_red_rising_book_6.pdf
    • https://uploads.strikinglycdn.com/files/74271bb7-9907-4ba9-8b3a-e34f2e2e9c8f/6941110192.pdf
    • https://uploads.strikinglycdn.com/files/f9fc97ae-b9d1-49af-b481-31f7fb6f0e89/a_murder_is_announced_play_script.pdf
    • https://uploads.strikinglycdn.com/files/b90951af-06d1-429c-96a9-2d4f8d2e5bd4/juwilomuda.pdf
    • http://xetorofowuwid.epizy.com/59217110477.pdf
    • http://zunapelivoguga.rf.gd/analytic_geometry_questions_and_answers.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f267.bin
f383552469de0401717ff2b197a31abd3656189367e647a1d1371166d7b1634e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF267 5144 bytes
font_01_sfnt_off00010412.bin
6fe5cb77af6878b04d1ce70b0b4a66bd227741dac4516f343b5c31bfac8ef1de
pdf-font-stream PDF embedded font (sfnt) at offset 0x10412 11080 bytes