Malicious PDF — malware analysis report

Static analysis result for SHA-256 37983de79efd4f2d…

MALICIOUS

PDF

88.1 KB Created: 2021-03-18 23:04:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d152f5bd6841abdccce39ba6b755b7f0 SHA-1: 56aa277351de5e15099b27ee540cfceaba5c5249 SHA-256: 37983de79efd4f2d1382a5e26cb184baede6847dcddfddee0938d742886dae3f
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, characteristic of a link farm designed to drive traffic to various websites. The primary URL suggests a lure related to job interview questions, likely to attract unsuspecting users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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-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/award?keyword=electrical+technician+interview+questions+and+answers+pdf
    • https://ragajepegoxi.weebly.com/uploads/1/3/1/3/131379061/sewifu_pifutikopoju.pdf
    • https://zaduguwage.weebly.com/uploads/1/3/0/8/130874015/4167498.pdf
    • https://sepolekabu.weebly.com/uploads/1/3/1/6/131606201/8fbea8b323e.pdf
    • https://tipozuroboga.weebly.com/uploads/1/3/4/2/134265922/3585434.pdf
    • https://jatuvukaxakepu.weebly.com/uploads/1/3/4/3/134313635/7656299.pdf
    • https://movulejovem.weebly.com/uploads/1/3/4/4/134470355/bobanob_guwevu_tezibefo.pdf
    • https://zubowosusotikip.weebly.com/uploads/1/3/1/6/131637009/111d0a2d.pdf
    • https://rajitogo.weebly.com/uploads/1/3/4/3/134377965/2194362.pdf
    • http://salestore.pro/denon_avr_x3500h_reviewyy5uw.pdf
    • https://rimejosokodux.weebly.com/uploads/1/3/4/6/134691074/2837426.pdf
    • https://tamilavijunaw.weebly.com/uploads/1/3/4/5/134506647/dexiwikobuxi.pdf
    • https://rapelolizoxofi.weebly.com/uploads/1/3/1/3/131381924/cabe06c25e.pdf
    • https://jonukejunuxesa.weebly.com/uploads/1/3/1/4/131409236/2812977.pdf
    • https://funogumoduwe.weebly.com/uploads/1/3/4/3/134309977/xagekosagotigufasox.pdf
    • http://musc-media.xyz/what_books_are_read_in_ap_literaturetzqye.pdf
    • http://form-lnstagramcopyrightservices.com/vovukorijokuroxevimevew9q0s.pdf
    • http://golosa-spasibo.ru/david_allan_coe_tourirydj.pdf
    • https://nabusaguvelono.weebly.com/uploads/1/3/4/0/134095838/1601768.pdf
    • https://xuniruki.weebly.com/uploads/1/3/0/7/130739043/legutunakiwexomaxafi.pdf
    • http://topcreditmonitoring.info/dadisujekaneladirru4sh.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://30383b9b-b26a-44f4-9a26-03873af8f03c.filesusr.com/ugd/fdee49_b10a5790f9c743c093910cb8f9cf3df4.pdf?index=true
    • https://b2d1eea7-aef5-47fc-962c-88b5513ecafc.filesusr.com/ugd/3a57bc_54e1016d31de40cd8b72c40de8e62ab2.pdf?index=true
    • https://fe426b01-1dd0-498a-b08e-7ec37e320b94.filesusr.com/ugd/6b45f0_df42605305554e1998c7fd3aee0d1b88.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001181e.bin
aefea7047189d8bbd47ceb254e133299ec2988f658af6562005f5fec76a5511e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1181E 5480 bytes
font_01_sfnt_off00012acf.bin
274ffbc80d60b16b3f52e4cdf22c456e20d21485db5288d790cc7043bc0b9eda		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12ACF 11092 bytes

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