Malicious PDF — malware analysis report

Static analysis result for SHA-256 62b823aacfc15642…

MALICIOUS

PDF

81.5 KB Created: 2021-03-16 01:01:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 7cea589056df2c15d7beaa236a9723a9 SHA-1: 2b513876cef4bfbfd7d9f5166ddcd500c46a964e SHA-256: 62b823aacfc156425e19d45a103df32b1658148ccf030c321c848db177e3247a
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a malicious document, likely used as a lure to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://leonvi.ru/strik?utm_term=feriado+dia+01+de+maio PDF link annotation
    • http://in-step.shop/1454242603rd04n.pdfIn PDF document text
    • https://cdn.sqhk.co/watexoba/hh8A9ys/28702537782.pdfIn PDF document text
    • https://cdn.sqhk.co/pixorikibam/giiaVib/bsc_1st_year_chemistry_notes_in.pdfIn PDF document text
    • https://pegiromilu.weebly.com/uploads/1/3/4/6/134683304/0dab998b31bf.pdfIn PDF document text
    • https://fevawitag.weebly.com/uploads/1/3/2/6/132695646/milipubejimifuj-sokumukub.pdfIn PDF document text
    • https://cdn.sqhk.co/juvanejejuwo/gehvhjW/38352622176.pdfIn PDF document text
    • https://cdn.sqhk.co/valujoper/jfwiejf/baby_care_play_mat_moroccan_beige.pdfIn PDF document text
    • https://cdn.sqhk.co/tasokuxu/ijjecjj/vidigunulavufado.pdfIn PDF document text
    • https://cdn.sqhk.co/veletafi/hjggkic/uae_exchange_rate_today_bangladesh_bank.pdfIn PDF document text
    • https://cdn.sqhk.co/ruxuvedije/if4vrs4/flappy_bird_hack_computer.pdfIn PDF document text
    • https://cdn.sqhk.co/rorajakura/GNghih9/idle_tap_bowling_mod_apk_android_1.pdfIn PDF document text
    • http://vengriya.space/white_boy_shuffle_bookap7ht.pdfIn PDF document text
    • https://xefikusog.weebly.com/uploads/1/3/5/3/135390274/4199542.pdfIn PDF document text
    • http://monongzhlh.space/meboxalifusilixokuzepugamfvjd7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://013c3ecd-17dd-4738-ad87-554153c764a5.filesusr.com/ugd/36f25b_82318da05b49406fb77da12f215e1fb1.pdf?index=trueIn PDF document text
    • https://43cb2d18-1589-43a7-b1c5-fe1278e1c76d.filesusr.com/ugd/370b54_c21adc2e5507446c8b399f2dd702b6f9.pdf?index=trueIn PDF document text
    • http://bowudizukeb.epizy.com/31634325028.pdfIn PDF document text
    • http://vowaderisosalel.epizy.com/johnson_6_hp_outboard_price.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_off0000ff7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7D 4912 bytes
SHA-256: b922f8b06dac69933e73196df6b659cd20866b543470f8c274e4cc1add81d88e
font_01_sfnt_off0001101d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1101D 13076 bytes
SHA-256: f24ee4d66a5eeb40467788d6420467b9d68383f2837696ba60f6dccec3388256

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