Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff7576eb3284d00a…

MALICIOUS

PDF

47.9 KB Created: 2020-03-12 12:12:34 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: a5a3ec61a9fb5f65cb00c43521ddd46a SHA-1: 66131b0a6f1e705efaf335d01060364f3bff5ab0 SHA-256: ff7576eb3284d00ac7fd59771f475d21a61a967720504b757438609fee2dff1a
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF contains a large number of external links pointing to other PDFs hosted on various domains, a technique often used for SEO manipulation or to distribute further malicious content. The ML classifier strongly indicated maliciousness. The document body text, though partially corrupted, contains the phrase 'Plucking uke songs' and references the PDF creation tool, suggesting a potential lure or theme for the linked content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://autodiscover.coprimag.com/uploads/1/3/0/8/130874239/130874239.html#plucking+uke+songs PDF link annotation
    • http://mydrivecash.com/uploads/1/3/0/6/130604414/1746a17c020e11.pdfIn PDF document text
    • http://holeosensor.net/uploads/1/3/0/5/130539934/wodotopexaxexepaj.pdfIn PDF document text
    • http://answersoperation.org/uploads/1/3/0/5/130588366/raneziloz.pdfIn PDF document text
    • http://minnesotahistorymuseums.org/uploads/1/3/0/5/130550925/gotuzetigaligov.pdfIn PDF document text
    • http://aqzsystems.net/uploads/1/3/0/6/130604191/32521.pdfIn PDF document text
    • http://beachbumsrentalhut.com/uploads/1/3/0/5/130539033/xuxusoxokopowome.pdfIn PDF document text
    • http://bradgoodsontutoring.com/uploads/1/3/0/6/130620752/tosaxujugoj_bixuvinu_bamopepomopi_xusige.pdfIn PDF document text
    • http://thetacollective.com/uploads/1/3/0/5/130590157/fojuraborobad.pdfIn PDF document text
    • http://gandkbuildingconstruction.com/uploads/1/3/0/8/130874680/kabuzibuneme_rekufoleja.pdfIn PDF document text
    • http://barbariancrossfit.com/uploads/1/3/0/7/130739661/buzojesumasegilom.pdfIn PDF document text
    • http://yardsocket.net/uploads/1/3/0/4/130489090/figamutubevaba_tularafobipo_fizuwediri.pdfIn PDF document text
    • http://capitalfinancialplanningcharitablefoundation.com/uploads/1/3/0/2/130287521/tozusetum.pdfIn PDF document text
    • http://classself.com/uploads/1/3/0/6/130604637/87c96b482f3a.pdfIn PDF document text
    • http://csisecurityinc.com/uploads/1/3/0/6/130603741/8776722.pdfIn PDF document text
    • http://familymarkets.org/uploads/1/3/0/5/130588542/2010077.pdfIn PDF document text
    • http://adsl-66-121-174-46.encorp.net/uploads/1/3/0/2/130289458/6120132.pdfIn PDF document text
    • http://ivflush.com/uploads/1/3/0/4/130488704/dibaseja.pdfIn PDF document text
    • http://www.terrellconsultinggroup.com/uploads/1/3/0/7/130775269/zigoduvijagatun-xogoxademuki-binoruxebag-fuxolazij.pdfIn PDF document text
    • http://proteinpantry.biz/uploads/1/3/0/7/130776168/3456095.pdfIn PDF document text
    • http://www.kallakehomemaintenanceco.com/uploads/1/3/0/2/130272945/galurigilovuzamop.pdfIn PDF document text
    • http://www.goldenehausnummer.com/uploads/1/3/0/4/130483286/kakiwepuwoxosa_vilom_tuwuxusamo.pdfIn PDF document text
    • http://www.cheryltesslersolit.org/uploads/1/3/0/6/130639477/guros.pdfIn PDF document text
    • http://nexcend.com/uploads/1/3/0/6/130639426/929004.pdfIn PDF document text
    • http://painn2power.org/uploads/1/3/0/5/130551659/wukidewakiwakuk_sokevo.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
🗂 Part of campaign: novific.com 3 samples

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007b88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B88 8172 bytes
SHA-256: 0ad91cbf835821061f94634618e949ec8debd5349ab5048b93219afde95bfcde
font_01_sfnt_off00009b3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B3C 16072 bytes
SHA-256: 5a0de9f0d8f131c7dcd80ef926154ce6f425b3eb9bbaa06b03861bf098f2d807