Malicious PDF — malware analysis report

Static analysis result for SHA-256 1533c5c387f57ef3…

MALICIOUS

PDF

118.0 KB Created: 2021-03-13 23:05:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b33f3e973e59c4e9574413b94ff1a0f8 SHA-1: 5673371e27787aa66a0d5ef2a3f0fc5daa1eb3dc SHA-256: 1533c5c387f57ef3fb345570b98857da3d8a1ef9a91ed5c4f6597419a62f5d27
176 Risk Score

Malware Insights

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

The PDF document contains heuristics indicating it's a lure for phishing, specifically using an SEO redirector to disguise a malicious download. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs, such as 'https://baarspo.ru/award?keyword=access+control+policy+iso+27001+pdf', are likely part of the phishing infrastructure. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the PDF may instruct the user to open a password-protected archive, a common tactic to bypass gateway security.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://baarspo.ru/award?keyword=access+control+policy+iso+27001+pdf PDF link annotation
    • http://creditactive.info/54741531339jxxpq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409806/normal_5ffbdb90dc019.pdfIn PDF document text
    • http://homearfes.com/jagadarunobavumenumetuda2g8t4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409619/normal_5feaf99d619ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383327/normal_60431d45ba01b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475734/normal_5fe3359fb4723.pdfIn PDF document text
    • http://center-san.ru/3246502643pgln1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449192/normal_5ff3c8ba57777.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387033/normal_60237fab15c9c.pdfIn PDF document text
    • http://autobuff.xyz/harry_potter_free_printablesn51n8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449172/normal_6044fe6d5c13e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420028/normal_5fe4dc2d862b7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377115/normal_5fee532ed2d7b.pdfIn PDF document text
    • http://myyshooop227.site/dell_optiplex_760_wont_power_on4bb4a.pdfIn PDF document text
    • http://vabuletarikinil.iblogger.org/challan_form_no_280.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461516/normal_600b4ad7ea305.pdfIn PDF document text
    • http://petrol-v-pol-price.site/alta_mar_netflix_parents_guideup728.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380854/normal_6045d834353e0.pdfIn PDF document text
    • http://creditreportfast.info/best_annotation_app_ipad_pencilxyov7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468289/normal_5fdf99664da60.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tulafixobokov.rf.gd/30488035017.pdfIn PDF document text
    • http://pasivete.epizy.com/template_powerpoint_hd.pdfIn PDF document text
    • http://weralawubuzeg.epizy.com/busybox_pro_apk_no_root.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19280 5436 bytes
SHA-256: 281af30f9cc061c4cc32d79a165c6fda8bfcea0cdb56b65ef62706402b04bec6
font_01_sfnt_off0001a531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A531 10780 bytes
SHA-256: cfb009b8f5f894a8c8c1b808658fd0db6deda2022ca35a83c3700e38b65d359d