Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef2814cdd91bc56a…

MALICIOUS

PDF

79.5 KB Created: 2021-05-31 19:20:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5a39f7f561da602cf69000b534e2f79 SHA-1: 717fdeb251bc703a23253d9106523a3c36a8f2c2 SHA-256: ef2814cdd91bc56a0e5ed2793b396f843b285eab4655aefa710f1c4a68e433c4
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, pointing to various PDF documents. The primary URL suggests a lure related to 'adobe premiere pro title templates free'. ClamAV and ML classifiers also flagged this file as malicious, specifically as a phishing trojan. The embedded content is heavily obfuscated and does not provide direct instructions, but the overall structure and heuristic firings indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://garglob.ru/pbw?utm_term=adobe+premiere+pro+title+templates+free
    • https://jumemovelavubar.weebly.com/uploads/1/3/4/5/134516611/961f83e05cfa8.pdf
    • https://static.s123-cdn-static-d.com/uploads/4424630/normal_60b4b36045ea8.pdf
    • https://girosiwubu.weebly.com/uploads/1/3/0/7/130740458/lekeboxikul-zokupepame-kafarez-fegudetizonup.pdf
    • https://zoseduzarososu.weebly.com/uploads/1/3/2/7/132740870/5856979.pdf
    • https://nebujabes.weebly.com/uploads/1/3/7/5/137515718/mekilusokazeri_mogefobimuzipul.pdf
    • https://bijivabaj.weebly.com/uploads/1/3/4/6/134601785/8443859.pdf
    • https://setasavapu.weebly.com/uploads/1/3/2/6/132683041/dc2f21ff12bfd6.pdf
    • https://static.s123-cdn-static.com/uploads/4369777/normal_5fc869fdcb308.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://lakebimutep.pbworks.com/w/file/fetch/144417756/how_to_know_what_size_your_gucci_belt_is.pdf
    • http://kufujibumufa.pbworks.com/w/file/fetch/144412485/how_to_do_a_paracord_handle_wrap.pdf
    • http://nunaruribeg.pbworks.com/f/33039224375.pdf
    • http://viluxese.pbworks.com/w/file/fetch/144413832/76217963152.pdf
    • https://uploads.strikinglycdn.com/files/4bc83014-188b-44b3-ba26-53742b46b440/visual_basic_2010_advanced_tutorial.pdf
    • https://uploads.strikinglycdn.com/files/ec861a70-fa0b-4c86-b8e6-b730f2bce567/45480128100.pdf
    • https://uploads.strikinglycdn.com/files/a1beaec0-476c-4e25-81cb-4617311f0dc0/libro_lehmann_geometria_analitica_problemas_resueltos.pdf
    • http://jajisaparev.pbworks.com/w/file/fetch/144419517/wukotugemovifek.pdf
    • https://uploads.strikinglycdn.com/files/052e7af2-b2ef-4110-a8b7-9b53ceab9a75/vishnu_sahasranamam_lyrics_hindi_mein.pdf
    • https://uploads.strikinglycdn.com/files/83fe6910-7b01-474a-94fa-3e3eff6605a2/38323622441.pdf
    • https://uploads.strikinglycdn.com/files/1278b27a-e7d4-4868-ac79-650fad38e4fb/vomizopod.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f863.bin
5b09efc9787698e6b875e09153d4c1c49f3267d1834721af789443cf9285e8c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF863 5316 bytes
font_01_sfnt_off00010a5b.bin
f06faa03e478b0481c7c6b9919062780e5d725eb0452c5189dce85b482b69f6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5B 10820 bytes

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