Malicious PDF — malware analysis report

Static analysis result for SHA-256 5333af6da5c2ea0f…

MALICIOUS

PDF

110.2 KB Created: 2021-05-28 01:53:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9c004e4accc57244d5beedd107827cc9 SHA-1: 0118ed9a2c430171496e5ec2ff2efe1e06fcb325 SHA-256: 5333af6da5c2ea0fbfd3a3c57a4dddfdcf0bf8451132df15b86ad439afbbff06
186 Risk Score

Malware Insights

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

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 0.9978

Heuristics 6

  • 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 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.
  • 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://dafemum.ru/123?utm_term=borat+movie++dual+audio PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4465267/normal_5ffc93ed75a1c.pdfIn PDF document text
    • https://fujelaxu.weebly.com/uploads/1/3/4/7/134704358/zofaxutofini_rijeretulafuje.pdfIn PDF document text
    • https://lowarimubabop.weebly.com/uploads/1/3/4/7/134712264/9983194.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466662/normal_5fc9db1453de7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375528/normal_5fce517bbeb34.pdfIn PDF document text
    • https://misekijenag.weebly.com/uploads/1/3/1/3/131380320/livef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480423/normal_601524d5e2d1d.pdfIn PDF document text
    • https://tofamofale.weebly.com/uploads/1/3/1/4/131406114/vatixu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389821/normal_600ea8cc15751.pdfIn PDF document text
    • https://resevaguwitim.weebly.com/uploads/1/3/5/2/135298688/6804996.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422643/normal_603ffcba897b3.pdfIn PDF document text
    • https://xifamileg.weebly.com/uploads/1/3/4/6/134687686/388fe.pdfIn PDF document text
    • https://sawulazu.weebly.com/uploads/1/3/4/5/134588127/1535655.pdfIn PDF document text
    • https://wejatinolu.weebly.com/uploads/1/3/1/4/131438249/ziripetokojuli-wunurorevi-guxowudamuwuno-jufazaxif.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://uploads.strikinglycdn.com/files/5b1121f2-9156-45e3-b8da-4324a25f2b44/7493747823.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fd04a71-a9b6-4d1b-98da-619ceaf848df/37069455860.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e94c4b3-c50e-4cd9-af27-49125841c8fc/resumen_libro_la_mascara_de_la_muerte_roja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1f2f1b2-f048-42d3-b656-b3c0b4231830/how_many_new_dog_man_books_are_there.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82b5edf9-37dd-4790-a71a-94af1ac5741f/star_wars_lost_stars_manga_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/180880c3-694b-4229-8cdb-21eeb6b1e2e5/70386412242.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0989f022-1aa9-472e-9316-b6e258aae5e7/what_type_of_sedimentary_structure_do_turbidites_show.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1497bb4-33d5-4000-a580-7a5ac826a6ba/lofufiwefawowuvavigo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad62a596-54ed-4bf4-9c07-b97d5f2652ed/starbucks_sirena_espresso_machine_for_sale.pdfIn 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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00016949.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x16949 29884 bytes
SHA-256: 150277d578536af3e6c4abe6091b2ebb3adbbfb808b95cc19f6d1eaa40f6dcac
font_00_sfnt_off00012732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12732 4904 bytes
SHA-256: 5de2ec4763613588c23cda202192590c8d7c1c92ec2d6d2b620bd966bf51348b
font_01_sfnt_off000137cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137CB 15428 bytes
SHA-256: 934bd028aef09c937d4522032023a8710e1f142169211f4a7c8db000486404a4
font_03_sfnt_off00019e5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19E5D 2752 bytes
SHA-256: 11bf571f0af05367446b2020c2f1c6267491649bc48117454eca19867f219dc9