Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0fe48281a157f70…

MALICIOUS

PDF

113.8 KB Created: 2021-03-08 10:26:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 6dec449ab29547ca456debbddded1b92 SHA-1: 35f50b6598fa761fd0297a173b897bb62264c084 SHA-256: a0fe48281a157f704730f5f43c6a26b7ddadcc7313f9b4543a84d46f5e24f858
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9986

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 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://xajibur.ru/wix?keyword=ap+chem+solutions+thermodynamics+answers PDF link annotation
    • http://pokypka.xyz/audacity_download_windows_7_64_bit_freejkniy.pdfIn PDF document text
    • http://help-violation.com/attestation_simplifie_particulier_employeurfbpc8.pdfIn PDF document text
    • http://onlinekartiadesi.com/lupez702ln.pdfIn PDF document text
    • http://jerunuju.mypressonline.com/what_is_recognition_in_public_international_law.pdfIn PDF document text
    • http://geniusenglish.space/kimobezetunowifebt80z.pdfIn PDF document text
    • http://xijipeva.mypressonline.com/how_much_is_the_everything_breakfast_at_bob_evans.pdfIn PDF document text
    • http://wogivodugakovek.mygamesonline.org/48877470583.pdfIn PDF document text
    • http://vedivux.mygamesonline.org/learn_advanced_english_grammar_online_free.pdfIn PDF document text
    • http://jusapp.club/navy_n_codes_n803d51.pdfIn PDF document text
    • http://sajitalunaded.22web.org/7831751014.pdfIn PDF document text
    • http://pazujiz.mygamesonline.org/ponirigafa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://verafewema.rf.gd/devotions_for_a_sacred_marriage_reviews.pdfIn PDF document text
    • https://s3.amazonaws.com/woneketelak/young_life_talk_woman_at_the_well.pdfIn PDF document text
    • http://dikekonigexixa.epizy.com/preparation_of_nanomaterials.pdfIn PDF document text
    • https://s3.amazonaws.com/mujevubutukoxu/new_punjabi_movies_2019_list.pdfIn PDF document text
    • https://65d0a56f-4074-4e8f-9acc-29e6f8e8f663.filesusr.com/ugd/37655d_22cc2c679e62448caa13d115ea949b6f.pdf?index=trueIn PDF document text
    • https://3c4962d9-41f7-4f14-8396-dad57cc8de20.filesusr.com/ugd/a2de88_2861c45383444d32b9655465b3885573.pdf?index=trueIn PDF document text
    • https://7f993087-45f6-41f4-96e5-9dcaca18fb91.filesusr.com/ugd/9a92dd_120acc6d87434aa08a534ab1cb4d373e.pdf?index=trueIn PDF document text
    • http://dukazaxotak.epizy.com/felovekugaxisobokiwase.pdfIn PDF document text
    • http://satawakerexe.atwebpages.com/how_to_use_hair_clipper_oil.pdfIn PDF document text
    • http://lugenizuridaj.atwebpages.com/ethics_and_the_limits_of_philosophy_chapter_1_summary.pdfIn PDF document text
    • http://judiserod.onlinewebshop.net/daniel_plante_composer.pdfIn PDF document text
    • https://7915398d-c9c2-4241-abdb-40cf742e4b8d.filesusr.com/ugd/d4df0f_f48c28dee2e44296bdd313a3fa61a66e.pdf?index=trueIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16813 5496 bytes
SHA-256: e99034f4049ae5248444dbfdb75c9dc6cb1d7980424aa367f14aee8459cc3f86
font_01_sfnt_off00017aaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17AAF 10840 bytes
SHA-256: faf6563a3d729fb11b002e2759932dd937b68b1e09de4a9acd2dd10fe73fe7dc
font_02_sfnt_off00019f94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19F94 17028 bytes
SHA-256: ca04f275b049f19f6afa6a47855c9b0dec0723c91e03cc874143a23f5e945862