Malicious PDF — malware analysis report

Static analysis result for SHA-256 b844b58605da0946…

MALICIOUS

PDF

158.8 KB Created: 2021-03-18 23:10:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4d02e9acb3bd32c3298e78971b9f20d6 SHA-1: e7945a26c444197a3451ee28ab4440502d237ea9 SHA-256: b844b58605da0946fe1a5d5c70ba26ad8a9865f7409058361e51944b121eba49
136 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The presence of an external URI pointing to 'golowaki.ru' suggests a potential command and control or download server. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass security filters.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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=sql+server+interview+questions+with+answers+pdf
    • https://cdn-cms.f-static.net/uploads/4467912/normal_5fdc4d676cf81.pdf
    • http://raxejudesezix.scienceontheweb.net/sc_dmv_phone_number_803.pdf
    • http://vogeposekuxav.66ghz.com/tuxegodovu.pdf
    • https://static.s123-cdn-static.com/uploads/4380070/normal_5fde2032b1c6e.pdf
    • https://static.s123-cdn-static.com/uploads/4449781/normal_5ff1df1cc744a.pdf
    • https://static.s123-cdn-static.com/uploads/4366665/normal_6001a82776d47.pdf
    • http://bezigex.iblogger.org/vulaj.pdf
    • http://zasasibibo.iblogger.org/jijakirozil.pdf
    • https://cdn-cms.f-static.net/uploads/4410211/normal_601fe20c7560b.pdf
    • http://nomudepalak.medianewsonline.com/ledesosofitovof.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vifusupegiza/24317402918.pdf
    • http://vomuvipovaridus.rf.gd/why_is_the_water_dispenser_not_working.pdf
    • https://s3.amazonaws.com/vesubodufisi/batch_image_resizer_free.pdf
    • https://s3.amazonaws.com/makumapikeze/pinakunuged.pdf
    • http://jasesazolaf.myartsonline.com/nixibad.pdf
    • https://uploads.strikinglycdn.com/files/35184240-2df6-49c7-9fe7-f4dc6a5ca6a8/prevailing_wage_fringe_benefits_pennsylvania.pdf
    • https://uploads.strikinglycdn.com/files/a17efc17-97eb-4472-96b9-8017af431875/g_shock_ga_110_set_analog_time.pdf
    • https://uploads.strikinglycdn.com/files/ff85a88c-e0c2-4af2-9186-9c5fbb252958/what_does_the_moon_represent_in_midsummer_nights_dream.pdf
    • https://s3.amazonaws.com/foneniz/5732445830.pdf
    • http://xuvotawelotito.epizy.com/cabral_industrial_organization.pdf
    • https://uploads.strikinglycdn.com/files/39cc7e27-7931-4d32-83f4-fa6661ecd363/19760743335.pdf
    • https://s3.amazonaws.com/fajonubinomeder/what_to_do_when_your_roku_remote_is_not_working.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00021bbd.bin
08292c0b38f6fff102ef07c4ddddfedd3656a536385a7c3fa0bc65bcc41ef5c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x21BBD 5508 bytes
font_01_sfnt_off00022e87.bin
81347f9960a4ea04987da1a45f42b67e3529375aa5fc1031eceb2171c0219f14		 pdf-font-stream PDF embedded font (sfnt) at offset 0x22E87 13436 bytes
font_02_sfnt_off00025805.bin
5b0d2701ab39d2f69c66d7d16c60d8db0b323aa0832947137e757b5401d27330		 pdf-font-stream PDF embedded font (sfnt) at offset 0x25805 16060 bytes

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