Malicious PDF — malware analysis report

Static analysis result for SHA-256 61142b35d15fa595…

MALICIOUS

PDF

72.4 KB Created: 2021-03-22 11:03:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0effdba30e817e6b93297f35c3f62f08 SHA-1: 753515ad0aedd489532c9ca70b99d08500f5a095 SHA-256: 61142b35d15fa59544dc20be0121e92ecb633e14af9fe8f8dca8409e52b0ca47
96 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The document body, though heavily obfuscated, suggests a lure related to 'algebra 2 review packet answers'. The presence of multiple embedded URLs, with one pointing to 'golowaki.ru', strongly suggests an attempt to redirect the user to a phishing or malware distribution site. No scripts were extracted, but the PDF structure itself likely facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://golowaki.ru/wix?keyword=algebra+2+review+packet+answers
    • http://kexawez.mygamesonline.org/mututivaridemotuga.pdf
    • http://hookup757.fun/gotimavuwigexizinojar7oeej.pdf
    • http://mibejar.sportsontheweb.net/22013206760.pdf
    • http://cethq.xyz/1708495027thzmp.pdf
    • http://ekzo-fruit.ru/tadab81g4h.pdf
    • http://slmit.fun/resutatobunejogonkhbb.pdf
    • http://siviveko.getenjoyment.net/a_strange_story_edward_bulwer_lytton.pdf
    • http://milanomoda-italy.website/281740682111k8ec.pdf
    • http://poverkavoda.website/paypal_prepaid_mastercard_customer_service_phone_numbervgw6l.pdf
    • http://cabinetsop.xyz/toro_621e_priceblqb4.pdf
    • http://uscreditmonitoring.info/15415328463345ii.pdf
    • http://uablog.website/58185492051d7ok.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/dufekifaral/lemexut.pdf
    • https://s3.amazonaws.com/lekizopiloref/feeding_guidelines_for_one_year_old.pdf
    • http://kavuduvolilazod.myartsonline.com/20615451066.pdf
    • https://s3.amazonaws.com/dowadotiju/69404399764.pdf
    • http://davofunup.onlinewebshop.net/acordes_en_piano_algo_esta_cayendo_aqui.pdf
    • http://tisavan.onlinewebshop.net/meaning_of_career_development.pdf
    • https://s3.amazonaws.com/sesafefanulokam/ledger_account_format.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1e0.bin
d477c127c2ebfd03b5b545586c8af2c150d95254da6df2aad5ae54b1d667f92e
pdf-font-stream PDF embedded font (sfnt) at offset 0xD1E0 5256 bytes
font_01_sfnt_off0000e3de.bin
e5d35a08fbf108f1cfe71be576508cdfb0352a89899f4aa374ab5df08b14f3fe
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DE 10124 bytes
font_02_sfnt_off00010654.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10654 4324 bytes