Malicious PDF — malware analysis report

Static analysis result for SHA-256 16fd13c2fae42caa…

MALICIOUS

PDF

119.0 KB Created: 2021-04-03 21:48:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: b420e433c652a832c1dce18891985e07 SHA-1: fd7866654ad691952a2c163a639477bfcc4457b9 SHA-256: 16fd13c2fae42caa1647b62a54e4c17a150ec91e8024a1706908475636e26f66
126 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL suggesting a lure for downloading software. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://resalured.ru/wix?keyword=gta+san+andreas+apk+download+aptoide PDF link annotation
    • http://csxmoney.info/84277820428c1wyh.pdfIn PDF document text
    • http://wewedaz.iblogger.org/english_to_bangla_vocabulary_free.pdfIn PDF document text
    • http://gerobotukonu.iblogger.org/reckless_love_of_god_ukulele_chords.pdfIn PDF document text
    • https://midonoguta.weebly.com/uploads/1/3/5/3/135347847/21d191af.pdfIn PDF document text
    • https://solakozejifu.weebly.com/uploads/1/3/5/3/135347449/nosutipogodivodu.pdfIn PDF document text
    • http://atlas-copco.su/chapter_4_aplia_homework_answerslun6a.pdfIn PDF document text
    • https://nenawopoweso.weebly.com/uploads/1/3/1/4/131406478/5305763.pdfIn PDF document text
    • http://kowubowawij.iblogger.org/42950304410.pdfIn PDF document text
    • http://design-kvartira.info/93324325671satia.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://c370dac7-4848-4fa0-a6df-94361299e8ba.filesusr.com/ugd/fa6303_d78f9a3f92634995bd49aafc15a00ee9.pdf?index=trueIn PDF document text
    • http://zewajus.rf.gd/amor_sempre_adenauer_novaes.pdfIn PDF document text
    • http://kafopazam.epizy.com/which_is_the_best_doro_mobile_phone.pdfIn PDF document text
    • http://ginokiximoz.rf.gd/beatles_let_it_be_lyrics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/028901d9-deac-4e81-972b-507a35d85525/26747346404.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc88b25f-46b2-491c-b39b-d31ce709aabb/james_baldwin_academy_california.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21444df7-e563-45c8-96f4-afef2b1b9736/3rd_grade_math_worksheets_multiplication_and_division_word_problems.pdfIn PDF document text
    • https://f187853a-68e6-4ed6-a420-9593b89d6738.filesusr.com/ugd/27c34a_8166883818f1491fa67f56179e925893.pdf?index=trueIn PDF document text
    • http://kidivilajovob.rf.gd/arduino_ide_slow_windows_10.pdfIn PDF document text
    • https://d670dda7-df53-4ef1-8eda-d3256df28744.filesusr.com/ugd/dbbbec_595b21ed085d416ca962ba591ff47d3e.pdf?index=trueIn PDF document text
    • https://a49aa754-465e-4bbd-924e-b3d0e7b66bd4.filesusr.com/ugd/81d6a4_db73a272442c48578b10efd320a4301d.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://scripts.sil.orgIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00015bee.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15BEE 29960 bytes
SHA-256: 26cdb7e082534f002202110c11160c1290573101dd45656287bc7ec12dfafbbe
font_00_sfnt_off00010a53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A53 2960 bytes
SHA-256: c67ab3902049199bb3b995ce9bbeb4900e936f712cee4d48b3a3f2d34619b8fe
font_01_sfnt_off000114de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114DE 5140 bytes
SHA-256: 9011f3c60cf24ac4362a18adf33f00e089dcbd48dd11e133d06cd7d99f18d1f7
font_02_sfnt_off00012682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12682 19844 bytes
SHA-256: 2f620cecba3da7c8ad82bc1a3693d01ef94f95f7f5de6ed68511742b7aacbee0
font_04_sfnt_off0001916f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1916F 8472 bytes
SHA-256: 59e119930014ac63eeb6e433a4ea302a6bba55ab8dcceee52e8edc05eee8c27c
font_05_sfnt_off0001ad3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AD3E 9604 bytes
SHA-256: 6280f357ff55b16fe5d833c8199a401e2fe5395d151bb428b9da0cea84e3fd15

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