Malicious PDF — malware analysis report

Static analysis result for SHA-256 db01409e1ac9fe5d…

MALICIOUS

PDF

85.3 KB Created: 2021-03-16 02:11:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16dbf0d3c74ce8e1b18ce53df06da4ac SHA-1: 346e11f3d2c540e4f5ceb3382a994eac4d71b098 SHA-256: db01409e1ac9fe5d68411593ab4ed6de8a85861d23b6c3ce831628993d777b21
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and exhibiting link farm characteristics, strongly suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URIs indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/strik?utm_term=oprah+winfrey+book+conversations+with+god
    • http://tujijamutibe.sportsontheweb.net/map_of_the_world_quiz.pdf
    • http://pimebujeben.66ghz.com/computer_science_class_11_book.pdf
    • http://bukanovetod.22web.org/cedre_conference.pdf
    • http://wegolurubakisud.22web.org/28607259236.pdf
    • http://gokawojop.scienceontheweb.net/is_the_5th_wave_a_good_book.pdf
    • http://xanejog.medianewsonline.com/list_of_companies_in_tamilnadu.pdf
    • http://komaxinatobofe.medianewsonline.com/how_to_set_safety_first_ear_thermometer_to_fahrenheit.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://mupevisad.epizy.com/the_great_god_pan_elizabeth_barrett_browning.pdf
    • http://vunefukovamin.rf.gd/how_to_smoke_a_roast_on_electric_smoker.pdf
    • https://s3.amazonaws.com/megulu/upload_file_bootstrap_template.pdf
    • https://74fc1a11-d445-4ffb-bc6b-7a79e5a65a18.filesusr.com/ugd/097bd5_4fe0814b6c884bad9f96643ee8d040fc.pdf?index=true
    • https://a3e8d6b6-68ee-4625-a313-a25a09dbd39d.filesusr.com/ugd/312e12_c345a1688ff24378afa52e47d508f591.pdf?index=true
    • http://mulitaweluf.rf.gd/1253457429.pdf
    • http://nivodonugito.rf.gd/amoeba_sisters_video_recap_alleles_and_genes_answers.pdf
    • http://kajomeki.epizy.com/aruppukottai_akka_ponnu_song_free.pdf
    • http://rijonitapadon.myartsonline.com/appraisal_report_sample.pdf
    • https://s3.amazonaws.com/remeranexe/95975643860.pdf
    • http://suxudogakol.myartsonline.com/what_are_statistical_inferences.pdf
    • https://8b5ac0f3-2bc4-49a6-9a99-2541af31b215.filesusr.com/ugd/f2ef67_9ade212bb59b4e0b8e86d5cb1265c4a0.pdf?index=true
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5d3.bin
a071262ea983ad748efd64e4095af8fe7ab2acb3ad245f61839977137358ad24
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D3 5660 bytes
font_01_sfnt_off00010921.bin
daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10921 1800 bytes
font_02_sfnt_off000111af.bin
ed61e5df39a2edce37a9e929ad47dc5a56bca615f4c8e013e2605c0bf54b7dad
pdf-font-stream PDF embedded font (sfnt) at offset 0x111AF 11232 bytes
font_03_sfnt_off000137b6.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x137B6 4324 bytes